22. A regression line describes the relationship between the dependent and independent variables and can be used to estimate specific points for x or y. For example, if y = 4.67x + 12.89, and y = 10.87, x would equal

Group of answer choices

A. 0.43

B. -0.43

C. 12.89

D. 63.65

23. What is the odds ratio for a study with a logistic regression coefficient -0.2524?

Group of answer choices

A. 0.78

B. 1.00

C. -0.78

D. -2524

24. A clinical trial is being conducted in order to determine the efficacy of a new drug that will be used to treat Crohn's disease. The efficacy of the medication will not only be determined by the physical improvement of symptoms but will also be determined by using a blood test to examine the concentration C-reactive protein (an inflammatory marker) in an individual's blood. If the researcher wants a margin of error for the level of C-reactive protein to be less than or equal to 2.9 mg/dL and the standard deviation for C-reactive protein concentrations among Crohn's disease patients was previously documented at 10.1 mg/dL, how many patients should be recruited for each group of individuals in the study, assuming a 95% confidence interval will be used to quantify the mean differences between the control group and the treatment group?

Group of answer choices

n for the treatment group = 12 and n for the control group = 12

n for the treatment group = 14 and n for the control group = 14

n for the treatment group = 47 and n for the control group = 47

n for the treatment group = 94 and n for the control group = 94

25. A researcher suspects the mean trough (the lowest dosage of medication required to see clinical improvement of symptoms) level for a medication used to treat arthritis is higher than was previously reported in other studies. If previous studies found the mean trough level of the population to be 3.7 micrograms/mL, and the researcher conducts a study among 93 newly diagnosed arthritis patients and finds the mean trough to be 6.1 micrograms/mL with a standard deviation of 1.2 micrograms/mL, the researcher's hypothesis, for a level of significance of 1%, should resemble which of the following sets of hypothesis?

Group of answer choices

A. H₀: = 3.7 micrograms/mL; H₁: > 3.7 micrograms/mL; alpha= .01

B. H₀: > 3.7 micrograms/mL; H₁: = 3.7 micrograms/mL; alpha= .01

C. H₀: = 3.7 micrograms/mL; H₁: > 3.7 micrograms/mL; alpha= .99

D. H₀: > 3.7 micrograms/mL; H₁: = 3.7 micrograms/mL; alpha= .99