Statistics students believe that the mean score on a first statistics test is 65. The instructor thinks that the mean score is higher. She samples 10 statistics students and obtains the scores: Grades 65 63.9 74.4 96 73.5 66.5 64.3 66.5 62.7 64.3 Test grades are believed to be normally distributed. Use a significance level of 5%. State the alternative hypothesis: HA:HA: μ>65μ>65 μ<65μ<65 μ≠65μ≠65 State the mean of the sample:  (Round to two decimal places.) State the standard error of the sample means:  (Round to four decimal places.)

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Statistics students believe that the mean score on a first statistics test is 65. The instructor thinks that the mean score is higher. She samples 10 statistics students and obtains the scores:

Grades 65 63.9 74.4 96 73.5 66.5 64.3 66.5 62.7 64.3



Test grades are believed to be normally distributed.

Use a significance level of 5%.

  1. State the alternative hypothesis: HA:HA:
    • μ>65μ>65
    • μ<65μ<65
    • μ≠65μ≠65
  2. State the mean of the sample:  (Round to two decimal places.)
  3. State the standard error of the sample means:  (Round to four decimal places.)
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