Solve the system of equations using the substitution method.
2 answers:
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Answer:
The mean waiting time of all customers is significantly more than 3 minutes, at 0.05 significant level
Step-by-step explanation:
Step 1: State the hypothesis and identify the claim.
Step 2: We calculate the critical value. Since we were not given any significant level, we assume , and since this is a right tailed test, the critical value is z=1.65
Step 3: Calculate the test statistic.
Step 4:Decide. Since the test statistic , 2 s greater than the critical value, 1.65, and it is in the critical region, the decision is to reject the null hypothesis.
Step 5: Conclusion, there is enough evidence to support the claim that the mean is greater than 3
