. Question 14 v 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 distribution. b. With 90% confidence the population mean minutes of concentration is between C] and C] minutes. c. If many groups of 41 randomly selected members are studied, then a different confidence interval would be produced from each group. About C] percent of these confidence intervals will contain the true population mean minutes of concentration and about C] percent will not contain the true population mean minutes of concentration. E: 015 pts 010:) 399 Details 0 Question 15 8 0:4 p1: 0100 8 99 CD Details A psychiatrist is interested in finding a 9896 confidence interval for the tics per hour exhibited by children with Tourette syndrome. The data below show the tics in an observed hour for 12 randomly selected children with Tourette syndrome. Round answers to 3 decimal places where possible. 811126209512164 a. To compute the confidence interval use a ? v distribution. b. With 98% confidence the population mean number of tics per hour that children with Tourette syndrome exhibit is between [:1 and C]. c. If many groups of 12 randomly selected children with Tourette syndrome are observed, then a different confidence interval would be produced from each group. About C] percent of these confidence intervals will contain Hie true population mean number of ties per hour and about C] percent will not contain the true population mean number of tics per hour. . Question 16 0/4 pts ' 100 99 0 Details Deon wants to advertise how many chocolate chips are in each Big Chip cookie at his bakery. He randomly selects a sample of 76 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 17.1. The population standard deviation is 1.3. What is the 90% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Assume the data is from a normally distributed population. Round answers to 3 decimal places where possible.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. $ + $. Question 18 0/4 pts ) 100 99 0 Details Assume that a sample is used to estimate a population mean /. Find the 95% confidence interval for a sample of size 38 with a mean of 56.2 and a population standard deviation of 18.3. Enter your answer as an open- interval (i.e., parentheses) accurate to 3 decimal places. 95% C.I. = The answer should be obtained without any preliminary rounding. A psychologist is interested in constructing a 95% confidence interval for the proportion of people who accept the theory that a person's spirit is no more than the complicated network of neurons in the brain. 56 of the F71 randomly selected people who were surveyed agreed with this theory. Round answers to 4 decimal places where possible. a. With 95% confidence the proportion of all people who accept the theory that a person's spirit is no more than the complicated network of neurons in the brain is between:]and :1- b. If many groups of 771 randomly selected people are surveyed, then a different confidence interval would be produced from each group. About C] percent of these confidence intervals will contain the true population proportion of all people who accept the theory that a person's spirit is no more than the complicated network of neurons in the brain and about C] percent will not contain the true population proportion. B 015 pts 01m) 2 99 G) Details 0 Question 2:) v 8014px; 01m) 399 Details You are interested in constructing a 95% confidence interval for the proportion of all caterpillars that eventually become butteries. Of the 390 randomly selected caterpillars observed, 46 lived to become butterflies. Round answers to 4 decimal places where possible. a. With 95% confidence the proportion of all caterpillars that lived to become a butterfly is between [:l and C]. b. If many groups of 390 randomly selected caterpillars were observed, then a different confidence interval would be produced from each group. About:] percent of these confidence intervals will contain the true population proportion of caterpillars that become butteries and about [:1 percent will not contain the true population proportion. Question 21 In a recent poll, 130 people were asked if they liked dogs, and 70% said they did. Find the Margin of Error for this poll, at the 95% confidence level. Give your answer to four decimal places if possible.. Question 22 We wish to estimate what percent of adult residents in a certain county are parents. Out of 600 adult residents sampled, 144 had kids. Based on this, construct a 95% confidence interval for the proportion p of adult residents who are parents in this county. Express your answer in tri-inequality form. Give your answers as decimals, to three places.

Express the confidence interval 0.857 + 0.085 in open interval form (i.e., (0.155,0.855)).\f