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Homework answers / question archive / A teacher hypothesized that the average of grades for a math test was 79

A teacher hypothesized that the average of grades for a math test was 79

Statistics

A teacher hypothesized that the average of grades for a math test was 79. Imagine 20 students took the test and the 95% confidence intervals of grades was (83, 90). Can the teacher's null hypothesis at 95% be rejected?

a. Yes

b. No

c. Can not tell from the given information

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Given Information

  • Average value: 79
  • Sample size: 20
  • Confidence interval: (83, 90)

Yes, the teacher's null hypothesis is rejected at 95% confidence level because the confidence interval does not contain the average value of grades for the math test.

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