question archive Business statistics students at Colonel Samuel College believe that the mean score on a first statistics test is at most 70
Business statistics students at Colonel Samuel College believe that the mean score on a first statistics test is at most 70
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Business statistics students at Colonel Samuel College believe that the mean score on a first statistics test is at most 70. An instructor, intending to prove that the mean score is higher, randomly samples 9 statistics students and obtains the following scores:
69.2 73.5 65 73.5 69.2 83.2 75.6 73.5 75.6
Test grades are believed to be normally distributed.
Use a significance level of 1%.
- Select the appropriate alternative hypothesis, H
2.Calculate the mean of the sample:
3.Calculate the standard error of the sample means:
4.Use the formula to calculate the test statistic: t
5.Use the student t-table to find the critical value:
6.Decision:
- Fail to reject the null hypothesis.
- Reject the null hypothesis.
