Exhibit 9-4 The manager of a grocery store has taken a random sample of 100 cust
ID: 3201767 • Letter: E
Question
Exhibit 9-4
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly different from 3 minutes.
1.) Refer to Exhibit 9-4. The correct set of hypotheses is:
2.) Refer to Exhibit 9-4. At the 0.05 level of significance, the correct critical value(s) is/are:
-1.96 and +1.96
-1.984 and +1.984
1.96
1.984
A.) B.) C.) D.)Explanation / Answer
SOLUTION1:
Null Hypothesis:
H0:=3 minutes
Alternative Hypothesis:
H1: 3
two tail test
Solution2:
alpha0.05
1-0.05=0.95--> confidence level
Z for 95% for two tail is
-1.96 and +1.96
OptionA
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.