BST322 Final Exam 2023 Questions and Answers

This is used when a conservative approach is desired and an expected cell frequency is less than 5 in a 2X2 table. - Fisher's exact test It is important to assess the magnitude or strength of a relationship because this assists you with deciding whether or not a variable A causes variable B. True or False - False A Z score of +/-1.96 is equivalent to these values on a normal distribution. - +/-2 standard deviations When examining the relationship between two interval or ration level variables, you can use a scatterplot to allow you to visualize the relationship between the two. True or False - True This term refers to how data spreads out or disperses within a distribution. - Variability A perfect negative relationship between two variables is expressed as r=0. True or False - False The arithmetic average of the data is called the: - Mean Public Health nurses want to compare the mean weight of US 6th graders to a sample of 6th graders in one school. Which statistical test is most appropriate - One sample t-test Psych nurses wanted to evaluate the effect of three different treatments for anxiety - positive imagery, therapeutic touch, and medication on anxiety score (interval data) while controlling for the effect of length of stay. Which test is most appropriate? - ANCOVA Data which uses numbers to provide categories or labels as well as the ordering of the categories are: - Ordinal When examining the relationship between a nominal variable and an interval or ratio variable, you would create a table using the nominal variables, calculate the mode and median of the interval or ratio variable, then make a decision regarding the relationship using the mode and median. True or False - False Chi-square tests can be conducted for a 4X3 contingency table. True or False - True Generally, an ANOVA test is used when 3 or more variables are compared. True or False - False In a negative relationship, as the score of one variable decreases, the score on the second variable decreases. True or False - False This is the measurement of dispersion equal to the square root of the mathematical variance. - Standard deviation A formal statement that there is an absence of relationship between variables when tested by a researcher is called: - Null Hypothesis The area of the theoretical distribution where the researcher will reject the null hypothesis is called: - Critical region Bivariate statistics refers to the statistical analysis of the relationship between two variables. True or False - True The difference between the highest and lowest score in a distribution is called: - Range A significant finding with the 2 sample t-test indicates a strong relationship exists between the 2 population means. True or False - False Relevant data that are expressed in numerical form are called: - Quantitative data An assumption used by statisticians which states that population parameters are normally distributed: - Central Limit Theorem Data which uses number values with an equal distance between values are: - Interval Not all variables retained in a regression model are required to be significant. True or False - True In a study that examines the effect of a peer mentor on the heart rate of patients, what is the dependent variable? - Heart rate Positive relationships between two variables indicate that, as the score of one increases, the score of the other increases. True or False - True