Which of the following is true? (10 points) A. In logistic regression, the predi

Question

Which of the following is true? (10 points) A. In logistic regression, the predictors are dichotomous, and the outcome is a continuous variable. B. When calculating a correlation coefficient between two continuous variables, the scales on which the variables are measured affect the value of the correlation coefficient. C. It is more difficult to reject a null hypothesis if we use a 10% level of significance compared with a 5% level of significance. D. The sample size required to detect an effect size of 0.25 is larger than the sample size required to detect an effect size of 0.50 with 80% power and a 5% level of significance.

Explanation / Answer

a) false, the outcome is dichotomous, and predictors may be continous as well as dichotomous.

b) false, correlation is scale free

c) false, 10% level is weaker, and probability of type I error =0.1 is more than 0.05

d) true, we need large sample size o detect an effect size of 0.25 is larger than the sample size required to detect an effect size of 0.50 with 80% power and a 5% level of significance.

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