Question 1

A popular theory is that presidential candidates have an advantage if they are taller than their main opponents. Listed are heights (in centimeters) of randomly selected presidents along with the heights of their main opponents. Complete parts (a) and (b) below. Height(cm)ofPresident 186 169 175 183 188 176 El Height(cm)oflillain Opponent 163 177 178 171 192 181 (E a. Use the sample data with a 0.01 significance level to test the claim that for the population of heights for presidents and their main opponents, the differences have a mean greater than 0 cm. In this example, le is the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the president's height minus their main opponent's height. What are the null and alternative hypotheses for the hypothesis test? H1: pd > 0 cm (Type integers or decimals. Do not round.) Identify the test statistic. t= 0.50 (Round to two decimal places as needed.) Identify the Pvalue. P-value = 0.319 (Round to three decimal places as needed.) What is the conclusion based on the hypothesis test? Since the P-value is greater than the significance level, fail to reject the null hypothesis. There is not sufcient evidence to support the claim that presidents tend to be taller than their opponents. b. Construct the confidence interval that could be used for the hypothesis test described in part (a). What feature of the condence interval leads to the same conclusion reached in part (a)? The confidence interval is cm P2 H11P1P2 v H01P1=P2 H01P1P2 H15P1