According to the College Board, the national average combined SAT score was 1010

Question

According to the College Board, the national average combined SAT score was 1010 last year. Jason wonders whether current EMU freshmen performed better on than the national average. To find out, he asks 100 EMU freshmen to write down their combined SAT score.

Jason knows that gender is a factor in average SAT scores and that 60% of current EMU freshmen are female. So, to make the results more accurate, he randomly selected 60 women, then randomly selected 40 men, and combined them to form his sample of 100.

  What method of sampling did Jason use?

a) Stratified

b) Systematic

c) Cluster

d) Simple random

Why should a t statistic be used to construct this 95% confidence interval?

a) s is unknown

b) n > 30

c) is unknown

d) is known

Explanation / Answer

(a) Since the population is divided into two mutually exclusive segments, the sampling used is startified sampling

(b) Since is unknown, t- test has to be used.

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