A teacher assumed that the average of grades for a math test was 80. Imagine 20 students took the te

Discussion in 'Calculator Requests' started by math_celebrity, Jan 7, 2017.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    A teacher assumed that the average of grades for a math test was 80. Imagine 20 students took the test and the 95% confidence interval of grades was (83, 90). Can you reject the teacher's assumption?

    a. Yes
    b. No
    c. We cannot tell from the given information

    a. Yes

    At the 0.05 significance level, yes since 80 is not in the confidence interval.
     

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