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. Show your work.
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.
Change in the workweek does not influence the production
State the alternative hypothesis.
Change in the workweek does influence the production
Compute the sign test (ie., how many plusses and minuses).
What is the probability of observing the results above just by chance?
State your conclusions.
Fail to reject the null hypothesis.