yllabus odules nnouncements Scussions ades: ogle Drive ice 365 opto Recordings m Question 2 < You are interested in finding a 90% confidence interval for the mean number of visits for physical therapy patients. The data below show the number of visits for 15 randomly selected physical therapy patients. Round answers to 3 decimal places where possible. 22 12 6 23 13 12 28 14 10 13 18 7 11 19 18 a. To compute the confidence interval use a distribution. b. With 90% confidence the population mean number of visits per physical therapy patient is between visits. and c. If many groups of 15 randomly selected physical therapy patients are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of visits per patient and about percent will not contain the true population mean number of visits per patient. Hint: Hints Video Textbook

Please help The first picture is the equation and the second is the question I need help on.

On the equation shown on the image below,  why would you change the expression inside the paranthesis signs when simplifying the expression?

For what values of x and y is (x+yi)2  an imaginary number?