13. [-/4.17 Points] DETAILS BBUNDERSTAT12 8.5.020.5. MY NOTES ASK YOUR TEACHER A random sample of /, = 16 communities in western Kansas gave the following information for people under 25 years of age x1: Rate of hay fever per 1000 population for people under 25 97 92 122 126 94 123 112 93 125 95 125 117 97 122 127 88 A random sample of /, = 14 regions in western Kansas gave the following information for people over 50 years old. x2: Rate of hay fever per 1000 population for people over 50 93 109 100 99 110 88 110 79 115 100 89 114 85 96 LA USE SALT i) Use a calculator to calculate x,, S,, X2, and s2- (Round your answers to four decimal places.) S1 = *2 = S,= (ll) Assume that the hay fever rate in each age group has an approximately normal distribution. Do the data indicate that the age group over 50 has a lower rate of hay fever? Use a = 0.05. (a) What is the level of significance? State the null and alternate hypotheses. O Ho: #1 = Uzi H1: #1* #2 OHg: H1 > #2; H1: #1 = #2 b) What sampling distribution will you use? What assumptions are you making? O The standard normal. We assume that both population distributions are approximately normal with known standard deviations. The Student's t. We assume that both population distributions are approximately normal with known standard deviations. The standard normal. We assume that both populati butions are approximately normal with unknown standard deviations. The Student's t. We assume that both population stributions are approximately normal with unknown standard deviations. What is the value of the sample test statistic? (Test the difference #1 - #2. Round your answer to three decimal places.) c) Find (or estimate) the P-value. O P-value > 0.250 O 0.125