Reading proficiency: An educator wants to construct a 99% confidence interval for the proportion of elementary school children in Colorado who are proficient in reading. Part: 0 / 3 Part 1 of 3 (a) The results of a recent statewide test suggested that the proportion is 0.77. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.05? A sample of elementary school children is needed to obtain a 99% confidence interval with a margin of error of 0.05. X 5Height and age: Are older men shorter than younger men? According to a natEonal report, the mean height for U.S. men is 69.4 inches. In a sample of 304 men between the ages of 60 and 69, the mean height was ; : 68.8 inches. Public health officials want to determine whether the mean height H for older men is less than the mean height of all adult men. Assume the population standard deviation to be 0 : 3.13. Use the 0:20.05 level of significance and the P-value method with the TI84 calculator. Part: 0 / 4 Part 1 of4 State the appropriate null and alternate hypotheses. Ho ' _,<_ d>|_I L.l l This hypothesis test is a |(Choose one) V ltest. ": u H1