need help with statistics homework problem, the problem uses stats formulas and z scores

In a trial designed to test the effectiveness of aspirin in preventing heart disease, 11,037 male physicians were treated with aspirin and 11,034 male physicians were given placebos. Among the subjects in the aspirin treatment group, 139 experienced myocardial infarctions (heart attacks). Among the subjects given placebos, 239 experienced myocardial infarctions. Use a 0.05 signicance level to test the claim that aspirin has no effect on myocardial infarctions. a. Test the claim using a hypothesis test. b. Test the claim using an appropriate condence interval. Duration times and Interval after times for Old Faithful Geyser are listed in the following table. Duration (seconds) 242 255 227 251 262 207 140 lntervalAfter(minutes) 91 81 91 92 102 94 91 Using that data, a linear regression was performed by DESMOS. The resulting information and graph are below. 1' = 0.04636, m = 0.0067349, b = 90.1903 a. Use the information to write the equation of the regression line. Is the line a good t of the data? Explain. b. Find the best predicted interval after for a duration of 253 seconds. The linear regression equation for the advertising expenditures, x, (in 1000s of dollars) and company sales, 3;, (in 1000s of dollars) is y = 50.7293: + 104.061 Use this equation to answer the questions below. a. Find the expected company sales for an advertising expenditure of 1.5 thousand dollars. b. How much would need to be spent on advertising if compa nv sales needed to be $250,000