STATISTICAL PROBLEMS

Statistical Problems



Statistical Problems

Chapter 9

Problem 9.3

Solution:

I used the normsinv function in Excel. I used p = 0.05 because we want the cutoff for the bottom and top 5%.

=NORMSINV(0.05) =

Therefore we reject H0 if z < -1.645 or z > 1.645

Problem 9.13

a.

Null Hypothesis

H0: mu = 14.6

Alternative Hypothesis

HA: mu ? 14.6

b.

Saying that the mean is statistically different from 14.6 when it's actually the same.

c.

Saying that the mean is no different from 14.6 when it's actually different.

Problem 9.15

Null Hypothesis

H0: mu = 375

Alternative Hypothesis

HA: mu ? 375

Problem 9.23

a.

Null Hypothesis

H0: mu = 8.17

Alternative Hypothesis

HA: mu ? 8.17

First I calculated the ...