Suppose that the sample mean for a random sample of 110 cars is 28.3 miles and assume the standard deviation is 3.2 miles. Is 26.9 against the alternative hypothesis that it is not 26.9? What is the test statistic?

Rubi Garner

Rubi Garner

Answered question

2022-10-24

Suppose that the sample mean for a random sample of 110 cars is 28.3 miles and assume the standard deviation is 3.2 miles. Is 26.9 against the alternative hypothesis that it is not 26.9? What is the test statistic?

Answer & Explanation

benyaep17

benyaep17

Beginner2022-10-25Added 11 answers

Hypothesis test:
H 0 : μ = 26.9
H a : μ 26.9
This is two tailed test.
x ¯ = 28.3
σ = 3.2
n=110
Test statistic z = x ¯ μ σ / n
Test Statistic, z = 28.3 26.9 3.2 / 110 4.588539 4.59
Test Statistic, z = 4.59

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