Author Question: The scores on a certain test are normally distributed with a mean score of 63 and a standard ... (Read 118 times)

BRWH · **on:** Aug 2, 2018

The scores on a certain test are normally distributed with a mean score of 63 and a standard deviation of 2. What is the probability that a sample of 90 students will have a mean score of at least 63.2108?

A) 0.3413 B) 0.3174 C) 0.1587 D) 0.8413

Question 2

The purpose of a linear regression line is to .

a. predict one set of scores from another set
b. display the bivariate distribution of X and Y
c. identify the mean of the X and Y variables
d. calculate the correlation coefficient