# Statistics mcqs

29. Regression uses the least squares method to fit a model. (Points : 1) True False Question 30. 30. The difference between the highest and lowest score in a distribution is called: (Points : 1) Semi-quartile range Range Mean Median Question 31. 31. This is the measurement of dispersion equal to the square root of the mathematical variance. (Points : 1) Mean Median Standard deviation Range Question 32. 32. This is used to compare means while controlling for the effect of a covariate. (Points : 1) ANOVA RANOVA ANCOVA Dependent t-test Question 33. 33. The assumptions for ANCOVA differ substantially from those for ANOVA. (Points : 1) True False Question 34. 34. When the researcher incorrectly rejects the null hypothesis, it is known as: (Points : 1) Hypothesis error Statistical significance Type I error Type II error Question 35. 35. 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: (Points : 1) One sample t-test MANOVA ANCOVA Dependent groups t-test Question 36. 36. What is the minimum level of measurement appropriate for the independent variable in a t-test? (Points : 1) Nominal Ordinal Interval Ratio Question 37. 37. ANOVA assumes which of the following? (Points : 1) Random sampling Normal distribution Dependent variable is at least interval Three or more groups of independent variable All of the above Question 38. 38. 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 (Points : 1) One-sample t-test ANOVA ANCOVA Independent t-test Question 39. 39. 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? (Points : 1) One sample t-test ANCOVA Independent t-test Logistic regression Question 40. 40. 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? (Points : 1) ANOVA ANCOVA Independent t-test Paired t-test Question 41. 41. 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? (Points : 1) One sample t-test Independent t-test Chi-square test ANOVA Question 42. 42. 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? (Points : 1) Independent t-test ANVOVA RM-ANOVA ANCOVA Question 43. 43. In a study that examines the effect of a peer mentor on the heart rate of patients, what is the dependent variable? (Points : 1) Peer mentoring Emotional status Heart rate Patients Question 44. 44. A variable with equal distances between score units which also has a true meaningful zero is: (Points : 1) Ordinal Cardinal Ratio Nominal Question 45. 45. The standard deviation is: (Points : 1) The difference between the 3rd and 1st quartile. The squared deviations from the mean. The difference between the highest and lowest scores. The square root of the variance. Question 46. 46. If a researcher accepts a null hypothesis when that hypothesis is actually true, she has committed: (Points : 1) a type I error a type II error no error a causation Question 47. 47. Chi-square tests can be conducted for a 4X3 contingency table. (Points : 1) True False Question 48. 48. This is used when a conservative approach is desired and an expected cell frequency is less than 5 in a 2X2 table. (Points : 1) Fisher’s exact test Cramer’s V Yates’ correction Regression Question 49. 49. The distribution of chi-square values is NOT normally distributed. (Points :…

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