共享题干题
编号：2690512
Use the following data to answer Questions 58 through 63.
An analyst is conducting a hypothesis test to determine if the mean time spent on investment research is different from three hours per day. The test is performed at the 5% level of significance and uses a random sample of 64 portfolio managers, where the mean time spent on research is found to be 2.5 hours. The population standard deviation is 1.5 hours.
1.The appropriate null hypothesis for the described test is:
- A.H0:μ=3 hours.
- B.H0:μ≤3 hours.
- C.H0:μ≥3 hours.
2.This is a:
- A.one-tailed test.
- B.two-tailed test.
- C.paired comparisons test.
3.The calculated z-statistic is:
4.The critical z-value(s) of the test statistic is (are):
5.The 95% confidence interval for the population mean is:
- A.{1.00 < μ < 3.50}
- B.{0.54 < μ < 4.46}
- C.{2.13 < μ < 2.87}
6.The analyst should most appropriately:
- A.reject the null hypothesis.
- B.fail to reject the null hypothesis.
- C.reach no conclusion because the sample standard deviation was not given.