1

$\mu = 200$

$\sigma = \sqrt{3^2 + 4^2} = \sqrt{25} = 5$

normal distribution

2

a) E

b) we would fail to reject the null hypothesis. this means that we do not have evidence to suggest there is a significant difference in the effectiveness of the two advertisements, Ad A and Ad B.

c) A

d) C

3

a) the sample is skewed left

b) 5.5

c) [1,8]

d) B… Q2 is at 6.25, but as it is skewed left, median > mean

4

29, $\mu = 20$, 100*.8*.2 = $\sigma = 16$

5

A. the less DF you have, the larger your CI and cv must be to accommodate for the lack of data / sample size

6

7 → .56