True or False - The primary purpose of randomization is to control confounding by allocating patients with similar distributions of background factors, which represent potential confounders, across comparator groups.

If the probability of responding when receiving a therapy is expected to be 0.9 based on prior research and the study is designed with a randomization ratio of 2:1 (e.g. twice as many subjects are assigned to therapy as opposed to standard of care), the probability of response for a subject entering the study is ...

Select one:

a. 0.9

b. Indeterminate

c. 0.594

d. 0.667

GRE scores on the biology component in 2015 were normally distributed with a mean of 671 and standard deviation of 121. A student scored 792 on the biology component in 2015. The percentile ranking of the student is:

Select one:

a. 95th percentile

b. 50th percentile

c. 68th percentile

d. 84th percentile

For data following thenormal distribution, one would expect the mean to be similar to the median.

Select one:

True

False

Suppose that you assessed 15 adults as to whether or not they had diabetes. What type of variable ishaving diabetes?

Select one:

a. Quantitative

b. Categorical non binary

c. Categorical binary