gas mileages (in miles per gallon) of 23 randomly selected sports cars are listed in the accompanying table. Assume the mileages are not normally distributed Uee the standard normal distribution or the t-distribution to construct a 90% confidence interval for the population mean. Justify your decision. If neither distribhution can be used, explain why. Interpret the results. EEE Click the icon to view the sports car gas mileages. Let a be the population standard deviation and let n be the sample size. Which distribution should be used to construct the confidence interval? be used to construct the confidence interval, since Identify the confidence interval. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. C (Round to one decimal place as needed.) O B. Neither the standard normal distribution nor the t-distribution can be used to construct the interval. Interpret the results. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. % of all random samples of 23 sports cars from the population of all sports cars will have a mean gas mileage (in miles per gallon) that is between the interval's endpoints. (Type an integer or a decimal. Do not round.) O B. With % confidence, it can be said that most sports cars in the population have gas mileages (in miles per gallon) that are between the interval's endpoints. (Type an integer or a decimal. Do not round.) O C. It can be said that (Type an integer or a decimal. Do not round.) % of all sports cars have a gas mileage (in miles per gallon) that is between the interval's endpoints. % confidence, it can be said that the mean gas mileage of all sports cars (in miles per gallon) is between the interval's endpoints. (Type an integer or a decimal. Do not round.) O D. With O E. Neither the standard normal distribution nor the t-distribution can be used to construct the interval.

The incomes of math tutors in a tutoring center of a university are normally distributed with a mean of $1100 and a standard deviation of $150 what percentage of tutors earn less than $900 a month

Use the normal distribution of SAT critical reading scores for which the mean is 514 and the standard deviation is 115. Assume the variable x is normally distributed. (a) What percent of the SAT verbal scores are less than 650​? (b) If 1000 SAT verbal scores are randomly​ selected, about how many would you expect to be greater than 550​? Click to view page 1 of the standard normal table. LOADING... Click to view page 2 of the standard normal table. LOADING...       Question content area bottom Part 1 (a) Approximately 1.181.18​% of the SAT verbal scores are less than 650. ​(Round to two decimal places as​ needed.) Part 2 (b) You would expect that approximately 0.880.88 SAT verbal scores would be greater than 550. ​(Round to the nearest whole number as​ needed.)

Assume the samples are random and independent, the populations are nomally distributed, and the population variances are equal. The table available below shows the prices (in dollars) for a sample of automobile batteries. The prices are classified according to battery type. At a = 0.10, is there enough evidence conclude that at least one mean battery price is different from the others? Complete parts (a) through (e) below. E Click the icon to view the battery cost data. (a) Let u1. P2. H3 represent the mean prices for the group size 35, 65, and 24/24F respectively. Identify the claim and state Ho and H. H Cost of batteries by type The claim is the V hypothesis. Group size 35 Group size 65 Group size 24/24F 101 111 121 124 D 146 173 182 278 124 140 141 89 (b) Find the critical value, Fo, and identify the rejection region. 90 79 84 The rejection region is F Fo, where Fo = (Round to two decimal places as needed.) (c) Find the test statistic F. Print Done F= (Round to two decimal places as…