Question: This means that we are 95% confident that the interval contains the actual value of . A company has just switched to a 4-day work week. It has measured the number of units produced per week for 10 employees before and after the change. Does the change impact production.

Employee Before After

A 25 23

B 26 24

C 27 26

D 22 19

E 29 30

F 25 24

G 29 22

H 30 32

I 25 23

J 28 21

Does changing the workweek influence sales? Use α =.05 2 tailed.

State the null hypothesis.

State the alternative hypothesis.

Compute the appropriate t-test.

SSd =

T=

State the critical t needed for significance (careful with the signs).

State your conclusions.

Compute Cohen’s d for correlated groups use the before group for the sd of the denominator

What would your conclusions be if you used the sign test and why?

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