Author Question: Suppose we randomly selected 250 people, and on the basis of their responses to a survey we assigned ... (Read 139 times)

cabate · **on:** Jun 24, 2018

Suppose we randomly selected 250 people, and on the basis of their responses to a survey we assigned them to one of two groups: high-risk group and low-risk group. We then recorded the blood pressure for the members of each group. Such data are called:
a. observational. c. matched.
b. experimental. d. None of these choices.

Question 2

One of the simplest ways to reduce random variation is to smooth the time series using moving averages and exponential smoothing.
Indicate whether the statement is true or false