Advanced Healthcare Statistics Practice Test

These questions are part of the practice quiz. Start practicing

• What does the Pearson correlation coefficient primarily assess?
• An experiment resulted in a p-value of 0.5. Which statement is true?
• The set of probabilities associated with each possible outcome in the sample space is referred to as what?
• What is the relationship between standard deviation and the normal distribution?
• Which element should an effective study plan include?
• Which confidence interval is likely to more accurately contain the true population mean?
• A null hypothesis regarding the incidence of childhood caries could read
• What measure(s) of the strength and direction of association can we get from a linear regression model?
• When should the Spearman correlation coefficient be preferred over the Pearson correlation coefficient?
• A z-score of 0 corresponds to which value?
• Why is it important for nurses to use evidence-based practice guidelines in the clinical setting?
• What defines a type II error?
• Which symbol denotes a null hypothesis?
• The first step to deciding which statistical technique to use is?
• Which statistical test can be used to assess if the sample mean differs significantly from a population mean?
• Which term describes a situation where one variable predicts the outcome of another variable?
• How is p(A) most accurately defined?
• Which of the following is true regarding normal distribution?
• Simple numerical or graphical summaries are referred to as?
• When is the Pearson correlation coefficient most appropriately used?
• A significant finding in a study generally suggests what?
• Which of these is NOT a technique for organizing statistical data?
• How is the marginal probability computed?
• What does p(B) represent?
• Which of the following is an assumption for the Pearson correlation coefficient to be valid?
• What does the term "regression toward the mean" refer to?
• At an alpha level of 0.05, what percentage represents the threshold for rejecting results?
• Health care practices have improved due in part to the use of?
• When determining class intervals in creating a relative frequency chart, each class must be?
• Researchers conducting a study with ____ power have a _____ probability of committing a type ____ error.
• Researchers articulate the expected relationships between the variables by the _______.
• A study compares five different genotypes with arbitrary coding. What type of measurement data was used?
• The ______ of any statistical test represents the probability that the results were obtained by chance alone.
• What does squaring the Pearson correlation coefficient (r²) tell us?
• Statistics use distinct symbols to represent specific information. Parameters are usually represented by
• Which techniques are commonly used to present and organize statistical data?
• The hypotheses of the study should?
• If p(A | B) = p(A), what can be concluded?
• What does the efficiency of a test measure?
• The frequency distribution of a data set is symmetric and the mean is 20. Which statement is true about this data set?
• In a study looking at the association between polyps in the colon and fiber consumption, which correlation method would be more appropriate?
• How is the a-level defined in statistical hypothesis testing?
• Which characteristic describes sensitivity in a test?
• Which of the following is important to include in defining a good research study?
• In a study examining income and cholesterol levels, which method could researchers use to remove the influence of age on the correlation between these two variables?
• Techniques that allow conclusions to be drawn about the relationships among different variables in a population sample are referred to as?
• What might it indicate if a small study finds no statistically significant relationship between smoking and lung cancer?
• A perfect inverse relationship would indicate an r value of what?
• What is the role of peer review in research?
• How is marginal probability calculated?
• A potential mistake when interpreting the data is to reject the null hypothesis when it is true. What is this known as?
• The Spearman correlation coefficient is best suited for which situation?
• When assessing statistical data, which of the following is essential for accurate interpretation?
• In what scenario is a confidence interval used?
• What occurrence defines a type I error?
• If a researcher concludes that there is an effect when there is none, this is known as which type of error?
• What is the set of probabilities associated with each possible outcome in the sample space called?
• Which theorem can be used to compute confidence intervals around the population mean from a single simple mean?
• What term describes the measure of how well a test can identify true positives?
• What kind of data distribution is most commonly associated with calculating confidence intervals?
• If a distribution is not symmetrical, which measure of central tendency is sensitive to outliers and skew-ness?
• In determining oral health differences in children, what would a possible null hypothesis state?
• Which measure indicates the strength and direction of association in a linear regression model?
• In a study looking at the correlation between annual income and cholesterol level, which of the following correlation methods could researchers use to remove the influence of age as a confounder?
• What is the difference between stepwise methods versus other approaches of selecting independent variables for a linear regression model?
• What is the appropriate graph to demonstrate the provided research weight data?
• The probability that the laboratory test is positive when given to a group of patients who have the disease is referred to as?
• If an experiment shows a strong effect size, what implication does this have for the study's power?
• Why is it vital for nurses to inform policy makers of current health care problems?
• What term describes the number of standard deviations a data point is from the mean?
• A study that often attempts to understand how variables are related to each other is referred to as?
• What is a characteristic of a normal distribution?
• Which of the following are assumptions required for the Pearson correlation coefficient to be valid?
• What adjustment is made to the R-squared value in multiple regression analysis?
• A study that often attempts to understand how variables are related to each other is referred to as?
• Which of the following describes the Pearson correlation test?
• In statistics, which quantity is denoted by σ2?
• What is the role of the p-value in hypothesis testing?
• In a logistic regression analysis, what does the odds ratio indicate?
• What is the main advantage of using a randomized controlled trial in research?
• The measure of how well a statistical model fits the data is known as?
• What does the equation p(A∪B) = p(A) + p(B) - p(A∩B) represent?
• A study looking at the correlation between cholesterol level and distance between home and work found a correlation coefficient of -0.13. How much of the variance in cholesterol level is explained by distance?
• Using a regression equation, which BMI would you anticipate for a 25-year-old who works 45 hours weekly?
• One of the important benefits of multivariate regression over other statistical tests is that it allows you to:
• Researchers articulate the expected relationships between the variables by the _______.
• What does a z-score indicate?
• In which situation would you employ a confidence interval?
• What does a regression analysis help to determine about the independent variable(s)?
• In pediatric assessments, how will a pediatrician compare an infant's growth progress?
• Research findings that display no significant difference when there is one can be attributed to which type of error?
• What does a p-value indicate in hypothesis testing?
• When is the one sample t-test used?
• One of the important benefits of multivariate regression over many other statistical tests is that it
• What type of study compares the participants' characteristics at a single point in time?
• In pediatric growth assessments, what is commonly used to compare an infant's growth to normal standards?
• A person wants to compare the average oxygen saturation for two patient groups. Which measurement scale should be used for the data?
• In hypothesis testing, what does it mean when the p-value is less than the significance level?
• When is a sample population curve more likely to resemble the population curve?
• What is the first step in deciding which statistical technique to use?
• In statistical analysis, what is referred to as the p-value?
• What statistical concept is represented by the z-score value?
• Researchers rely on what to draw meaningful conclusions from collected data?
• Which rule is associated with conditional probability?
• What type of probability refers to the likelihood of one event occurring given that another event has occurred?
• A study was conducted looking at the association between number of polyps in the colon and mean grams of fiber consumed per day. Which form of correlation would be more appropriate to report if at least one variable does not meet the distribution assumption required to use Pearson correlation?
• What does a correlation coefficient of -1 indicate?
• What is a common mistake seen in the planning of research studies?
• At one year old, a child's height of 26 inches is at the 50th percentile. Which statement is true about this data?
• What does the alpha-level signify before conducting statistical tests?
• Correlation coefficients can measure which of the following?
• Which statistical test would be appropriate for comparing the means of two independent groups?
• What conclusion can be drawn regarding the impact of nurses' educational levels on patient care?
• What statistical measure is used to assess how different two variables are from one another?
• Which statistical test is appropriate for categorical data?
• What is the alpha-level defined as in hypothesis testing?
• Squaring the Pearson correlation coefficient (r²) tells us?
• A strong correlation (>0.85) between the independent variables included in a multivariate linear regression model indicates which assumption may have been violated?
• A psychologist is interested in how well clients are doing on a certain treatment. The data collected from a client’s survey response will create what type of scale?
• Linear regression is appropriate for what type of dependent variable?
• Which factor does NOT influence the power of a test?
• What is a common mistake researchers make when planning their studies?
• What type of relationship is described by linear regression?
• Which term describes the probability of a positive test result for patients who do not have the disease?
• Which of the following is not part of a research project used statistically?
• What does the null hypothesis state in hypothesis testing?
• Which of the following statistical tests provides a p-value?
• What has been found to be critical in caring for certain patients in relation to the nursing shortage?
• Which statistical test is best suited for determining differences between more than two groups?
• The Pearson correlation coefficient is best for measuring the strength of what type of relationships?
• What do we mean by "regression toward the mean"?
• Which statistical test would you use to compare the means of two independent groups?
• The researcher has determined the project has an alpha level of 0.05. This indicates all values outside ____ will be rejected.
• In a multivariate regression model, what does a coefficient of determination (r2) of 0.23 indicate about the predictors?
• A strong correlation (>0.85) among independent variables in a regression model violates which assumption?
• What type of error does failing to detect an effect when one actually exists represent?
• What is a correct interpretation of the a-level in the context of statistical tests?
• A study looking at the correlation between cholesterol level and distance between home and work found a correlation coefficient of -0.13. How much of the variance in cholesterol level is explained by distance between home and work (i.e., what is the coefficient of determination)?
• How would an increase in sample size affect the sampling distribution?
• Which measure represents the 50th percentile?
• What are simple numerical or graphical summaries of data referred to as?
• In terms of statistical significance, a p-value less than 0.05 typically indicates what?
• A research project that follows the participants forward in time to identify future outcomes is referred to as
• What is a key property of the 75th percentile?
• Commonly used techniques for presenting and organizing statistical data include which of the following?
• Data values that do not fit the pattern of the rest of the data are referred to as which of the following?
• Which statement is true about hypotheses?
• Which property is characteristic of the normal distribution?
• Confidence intervals around the population mean can be calculated using which principle?
• What should the hypotheses of a study state?
• Which term describes the spread of a data set?
• What is the purpose of hypothesis testing in statistics?
• Which of the following methods can increase statistical power?
• How must the study plan hypotheses be characterized?
• A null hypothesis being not rejected, but later found to be false, is an example of what type of error?
• What is a crucial factor when developing a hypothesis for a study?
• What is the main distinction between stepwise methods and hierarchical methods in regression?
• In hypothesis testing, what is the purpose of the alternative hypothesis?
• What is a primary goal of using statistical analysis in healthcare research?
• If a statistical test yields a significant result, what does it imply?
• When collecting data, what type of variable is defined as having two distinct categories?
• Which aspect of a study plan is required to be very specific?
• What practice has contributed to the improvement of health care practices?
• The Pearson and Spearman correlation coefficients are used to measure what?
• How would you interpret a correlation coefficient of -1?
• What type of research design is characterized by collecting data at one point in time?
• In which circumstance would you use a Chi-square test?
• What does r² measure in a correlation analysis?
• What is the central tendency measure that is least affected by outliers?
• When defining a good research study, which of the following should be included?
• Which type of probability allows distribution of events to be inferred without collecting data?
• A multivariate regression model found a coefficient of determination (r2) of 0.23. How would you interpret this statistic?
• A null hypothesis was not rejected, and later it was found that the results were false. This is an example of what type of error?
• Under which of the following conditions would you need to use the Spearman correlation coefficient and not the Pearson correlation coefficient?
• A potential mistake when interpreting the data is to reject the H0 when it is true. This is referred to as
• What does the _____ of a test represent?
• What predicted body mass index (BMI) is calculated for someone age 25 years who works 45 hours per week using the regression equation Y = -3.95 + 0.04(hours worked) + 1.21(age)?
• What is the first step in the hypothesis testing process?
• How are techniques that allow conclusions about variable relationships in a sample defined?
• When is the Spearman correlation coefficient appropriate to use?
• What type of probability is defined as the probability that one event will occur given that another event has occurred?
• What type of relationship between a dependent and independent variable is described by linear regression?
• A research project that follows participants forward in time to identify future outcomes is known as?
• The value that separates the highest 25% of data from the rest is called?
• Which statistical measure assesses the goodness of fit for a regression model?
• Linear regression is best suited for which type of dependent variable?
• In a study, the correlation coefficient indicates a strong positive relationship when?