9.11: Chapter Solution (Practice + Homework)

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Figure \(\PageIndex{12}\)

38.

a right-tailed test

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a left-tailed test

42.

This is a left-tailed test.

44.

This is a two-tailed test.

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c
1. 51.
  b
  d
  55.
  d
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  1. 58.
    1. 60.
      1. 62.
        64.
        66.
        69.
        71.
        73.
        c
        c
        77.
        79.
        81.
        83.
        85.
        \(H_0: \mu \geq 150 H_a: \mu < 150\)
        \(p\)-value = 0.0622
        alpha = 0.01
        Do not reject the null hypothesis.
        At the 1% significance level, there is not enough evidence to conclude that freshmen students study less than 2.5 hours per day, on average.
        The student academic group’s claim appears to be correct.