Question 4 • Advanced Algebra: Concepts and Connections
A real estate agent is working for a developer who claims that the average commute time to downtown is 20 minutes with a standard deviation of 7 minutes. Stephon is an independent real estate agent and wants to check the times for his client. He took a random sample of 15 commute times and found an average of 26 minutes. He did hypothesis testing using a significance level of 5 percent Which conclusion could he make?
Answer
A
The z -statistic is 0 point 2 2 , so the null hypothesis should not be rejected.
B
The z -statistic is 3 point 3 2 , so the null hypothesis should be rejected.
C
The z -statistic is 3 point 6 7 , so the null hypothesis should be rejected.
D
The z -statistic is 1 point 6 9 , so the null hypothesis should not be rejected.