Review1

(c) Use the above output to estimate the additive effect of a 5 o C environment on log blood pressure. Moreover, obtain an estimate of the multiplicative effect of a 5 0 environment on blood pressure of the rats. (d) Do the data provide sufficient evidence that rats exposed to a 5 o C environment have a higher mean blood pressure than rats exposed to a 26 o environment? Answer the question by carrying out an appropriate test for the log-transformed data. In particular, define the null and alternative hypotheses; report the value of the test statistic and the p-value of the test. State your conclusions. Moreover, obtain a 95 % confidence interval for the additive effect of a 5 o C environment on log blood pressure. (e) Use the 95% confidence interval obtained in part (b) to compute by hand a 95% confidence interval for the multiplicative effect of a 5 o C environment on blood pressure (take the antilogarithms of the endpoints). Summarize the interval in one sentence. Part 2: Experiment 2 In the second experiment 20 rats were randomly selected and their blood pressure was recorded in the temperature of 26 o C. Then the blood pressure of those 20 rats was measured again at 5 o C environment. The mean of the blood pressure differences (the blood pressure at 5 o C minus the blood pressure at 26 o C) was 110.5 (mm Hg) and their standard deviation 14.4859 (mm Hg). (f) Do the data allow us to conclude that rats exposed to a 5 o C environment have higher blood pressure than rats hold in a normal temperature? Carry out the appropriate test in SPSS to answer the question. In particular, specify the null and alternative hypotheses, report the value of the test statistic, the distribution of the test statistic under the null hypothesis and the p-value of the test. State your conclusions. Descriptives 5.2431 2.683E-02 5.1893 5.2968 5.2379 5.2040 4.104E-02 .2026 4.91 5.68 .77 .3023 .462 .316 -.528 .623 5.6898 3.324E-02 5.6232 5.7564 5.6871 5.6490 6.298E-02 .2510 5.26 6.19 .93 .3847 .299 .316 -.696 .623 Mean Low er Bound Upper Bound 95% Confidence Interval for Mean 5% Trimmed Mean Median Variance Std. Deviation Minimum Maximum Range Interquartile Range Skew ness Kurtosis Mean Low er Bound Upper Bound 95% Confidence Interval for Mean 5% Trimmed Mean Median Variance Std. Deviation Minimum Maximum Range Interquartile Range Skew ness Kurtosis GROUP 1.00 2.00 LNPRESS Statistic Std. Error