Chapter 7. Hypothesis Testing with One Sample
Chapter 7. Hypothesis Testing with One Sample
Chapter 7. Hypothesis Testing with One Sample
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<strong>Chapter</strong> 7: <strong>Hypothesis</strong> <strong>Testing</strong> <strong>with</strong> <strong>One</strong> <strong>Sample</strong> 233d. The claim is that the population standard deviation of systolic blood pressure of women infected <strong>with</strong> thenew viral strain is 13.1, so this is a two-tailed test. The sample size is n = 16 making the degrees of freedomdf = 15. The significance level is 0.05.H 0 : σ = 13.1H 1 : ≠ σ 13.12(n −1)s 15⋅The test statistic is χ 2 22.5232= = = 44.341σ 2 13.1 2In a two-tailed test at the 0.05 significance level <strong>with</strong> df = 15, the critical values are χ 2 = 6.262 andχ 2 = 2<strong>7.</strong>488.In the row for 15 degrees of freedom, the test statistic lies above 32.801, so the P-value is less than 0.01.We reject the null hypothesis.There is sufficient evidence to warrant the rejection of the claim that the population standard deviation ofsystolic blood pressure of women infected <strong>with</strong> the new viral strain is 13.1.e. Yes, the variability of the blood pressures has greatly increased.