# BST 322 BST322 Final Exam Answers (National University)

- To determine the proportion of variability in one variable that can be accounted for or explained by the variability of a second variable, you would calculate a correlation coefficient, then take its square root.
- When the researcher incorrectly rejects the null hypothesis, it is known as:
- Data which uses numbers to provide categories or labels as well as the ordering of the categories are:
- Multivariate statistics refers to the statistical analysis of the relationship between two variables.
- This is the measurement of dispersion equal to the square root of the mathematical variance.
- Data which uses number values, has an equal distance between values, and has a possible absolute zero is:
- Generally, an ANOVA test is used when the means of 3 or more groups are compared
- If a researcher accepts a null hypothesis when that hypothesis is actually true, she has committed:
- A formal statement that there is a relationship between variables when tested by a researcher is called:
- You are studying the effect of hypnosis on weight loss. You will measure each patient's weight pre- and post-intervention. The most appropriate test is:
- Causation is not synonymous with association.
- A set of subjects, usually randomly sampled, selected to participate in a research study is called:
- The difference between the highest and lowest score in a distribution is called
- 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
- A variable with equal distances between score units which also has a true meaningful zero is:
- When examining the relationship between two nominal level variables, you can use a scatterplot to allow you to visualize the relationship between the two.
- 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?
- 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
- Critical care nurses wanted to evaluate the effect of heparin vs saline IV flush solution on IV patency (patent vs not patent). Which test is most appropriate?
- This is used when a conservative approach is desired and an expected cell frequency is less than 5 in a 2X2 table.
- Regression uses the least squares method to fit a model.
- This is used to compare means while controlling for the effect of a covariate.
- A nurse researcher wanted to evaluate blood pressure in a set of patients/research subjects at 1, 3, and 6 months. What test would be most appropriate?
- Data which uses number values with an equal distance between values are:
- A group of neonatal nurses wanted to know if there was a difference in mean heart rate between premature babies who were swaddled and babies who were not swaddled. Babies were randomly assigned to swaddling or no swaddling. Which test is most appropriate?
- A perfect negative relationship between two variables is expressed as r = - 1
- A Z score of +/-1.96 is equivalent to these values on a normal distribution.
- The distribution of chi-square values is NOT normally distributed
- Not all variables retained in a regression model are required to be significant
- 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.
- A significant finding with the 2 sample t-test indicates a strong relationship exists between the 2 population means.
- The arithmetic average of the data is called the:
- Positive relationships between two variables indicate that, as the score of one increases, the score of the other increases.
- The area of the theoretical distribution where the researcher will reject the null hypothesis is called:
- An assumption used by statisticians which states that population parameters are normally distributed:
- Chi-square tests can be conducted for a 4X3 contingency table.
- A score that is likely to fall into the middle 68% of scores of a normal distribution will fall inside these values:
- It is not necessary to look at the frequency distribution if the mean, median, and mode are known.
- An entire set of individuals or objects having some common characteristics is:
- A result that is probably not attributable to chance is:
- Correlation coefficients, r, range from -1.00 to +1.00.
- The standard deviation is:
- The assumptions for ANCOVA differ substantially from those for ANOVA
- Parametric tests can be used with any type of data
- ANOVA assumes which of the following?
- In a negative relationship, as the score of one variable decreases, the score on the second variable decreases.
- In a study that examines the effect of a peer mentor on the heart rate of patients, what is the dependent variable?
- Relevant data that are expressed in numerical form are called
- What is the minimum level of measurement appropriate for the independent variable in a t-test?
- This term refers to how data spreads out or disperses within a distribution