A SRS of 277 Wisconsin residents between the ages of 25 and 64 with yearly earnings reveals that the average gross income in 2020 was $44,568. Assume a population standard deviation of $15,808. 1. Find and interpret a 90% confidence interval for the mean gross income in 2020 of all Wisconsin residents between the ages of 25 and 64. 2. What size sample of 25 to 64 year old earners in Wisconsin should be taken if we want to be 90% confident of the true gross income to within $200? Submit your final answers and all work here. doc, docx, pdf, png, jpeg files only! Instructions Use the information below to answer the questions to the right. Drag n' Drop here or Browse Small business owner A small business owner believes that updating the look of their store will increase how long customers spend in the store, therefore increasing how much money is spent. The long-standing average was 15.8 minutes with standard deviation 6.2 minutes. After rearranging and updating the store, a random sample of 83 customers has a mean of 17.4 minutes. If the small business owner finds that updating the look of the store is not enough to increase the amount of time spent in the shop, they plan to hire a consultant to help them improve their customer's experience. 10 5 points State the null and alternative hypotheses in this situation. BIUA 12pt Paragraph A fx