Please answer all the questions, thanks

(1) A well-known study of 22,000 male physicians was conducted to determine if taking aspirin daily reduces the chances of a heart attack. Half of the physicians were given a regular dose of aspirin while the other half was given placebos. Six years later, among those who took aspirin, 104 suffered heart attacks while among those who took placebos, 189 suffered heart attacks. Does it appear that the aspirin can reduce the number of heart attacks among the sample group that took aspirin? Use a = 0.01. State Ho and Ha and identify the claim , Calculate the test statistic, z, Calculate the p-value, Decided to reject Ho or fail to reject Ho. Justify your answer!, Write the conclusion in words I the context of the claim. Q2) A local restaurant claims that the waiting time for its patrons to be served is the lowest in the area. A competitor restaurant checks the waiting times at both restaurants. The sample statistics are listed below. Test the local restaurant's hypothesis. Use a = 0.05. Assume the populations standard deviation are not equal. Local Restaurant Competitor Restaurant n1 = 14 n2 = 19 x1 =5.4 minutes x2 =5.7 minutes $1 = 1.1 minutes $2 = 1.0 minute State Ho and Ha and identify the claim, Calculate the test statistic, t, Calculate the p-value, Decided to reject Ho or fail to reject Ho. Justify your answer, Write the conclusion in words I the context of the claim. Q3) A study was conducted to determine if the salaries of elementary school teachers from two neighboring districts were equal. A sample of 17 teachers from each district was randomly selected. The mean from the first district was $38,900 with a standard deviation of $3300. The mean from the second district was $40,300 with a standard deviation of $3100. Test the claim that the salaries from both districts are equal. Assume the samples are random and independent, and the populations are normally distributed. Also, assume that population variances are equal (sigma subscript 1 squared equals sigma subscript 2 squared. Use a = 0.05