In a survey, 23 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $33.6 and standard deviation of $17.5. Estimate how much a typical parent would spend on their child's birthday gift (use a 98% confidence level). Give your answers to 3 decimal places. Express your answer in the format of I + E. $ + $ Module7Homework- MATH: X " [lathboarrl needu/dZIflelooMerit/2BASED/viewCQntenUEEAZBBOMew A Score on last try: 4 of 5 pts. See Details for more. > Next question C: Get a similarquestion You can retry this question below A researcher is interested in finding a 90% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 41 students who averaged 42.4 minutes concentrating on their professor during the hour lecture. The standard deviation was 10.9 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a 1 v " distribution. b. With 90% confidence the population mean minutes of concentration is between and minutes. c. If many groups of 41 randomly selected members 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 minutes of concentration and about percent will not contain the true population mean minutes of concentration. Hint: Hints '5' Video' [+] Submi estion v == 9 Type hereto search 0 e 7-. a a a JavrMusuyclear A El 1.7 a Si 3:3; %)