In order to select a stratified random sample of 500 individuals ...

[moongchi]

In order to select a stratified random sample of 500 individuals from a population of 25000 individuals in which 15 are seniors, 19 are juniors, 20 are sophomores, and 46 are freshmen, _____ juniors should be included in the sample.
 
  a. 95 c. 190
  b. 75 d. 7.50

Question 2

In order to estimate the attention level of college undergraduates in the United States, a psychologist measures the attention span of the undergraduates at a local university. The mean of these scores is a _________.
 
  a. parameter c. statistic
  b. population d. sample

[dmurph1496]

Answer to Question 1

A
19 of 500 is 95 individuals.

Answer to Question 2

C

[moongchi]

TYSM

[carlsona147]

Thanks for the timely response, appreciate it