State What the Given Confidence Interval Suggests About the Two

question 162

Essay

State what the given confidence interval suggests about the two population means.
-A researcher wishes to determine whether the blood pressure of vegetarians is, on average, lower than the
blood pressure of nonvegetarians. Independent simple random samples of 85 vegetarians and 75
nonvegetarians yielded the following sample statistics for systolic blood pressure: $$\begin{array} { | l l | } \hline \text { Vegetarians } & \text { Nonvegetarians } \\ \overline { \mathrm { n } _ { 1 } } = 85 & \overline { \mathrm { n } _ { 2 } } = 75 \\\overline { \mathrm { x } _ { 1 } } = 124.1 \mathrm { mmHg } & \overline { \mathrm { x } _ { 2 } } = 138.7 \mathrm { mmHg } \\\mathrm { s } _ { 1 } = 38.7 \mathrm { mmHg } & \mathrm { s } _ { 2 } = 39.2 \mathrm { mmHg } \\\hline\end{array}$$ Use a significance level of 0.01 to test the claim that the mean systolic blood pressure for vegetarians is lower
than the mean systolic blood pressure for nonvegetarians. Use the P-value method of hypothesis testing.

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