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4. A researcher wishes to determine whether people with high blood pressure can reduce their blood pressure by following a particular diet. The sample data is shown below, where Hs represents the mean blood pressure of the treatment group and u, represents the mean for the control group significance level of 0.01 and whichever method you deem appropriate (p-value method, critical value . Use a method, or confidence interval method) to test the claim that the diet reduces the blood pressure. We do not know the values of the population standard deviations. Use Microsoft Excel or the following t- distribution table: http://www.itl.nist.gov/div898/handbook/eda/section3/eda3672.htm ETMENTCONTROL GROuP GROUP ni x, 189.1 i2 203.7 85 n2 75 s 38.7 52 39.2 51
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