principal bENe nigh Of absences ents ASsume lat a nigh scr ability to perform on standardized tests. He randomly selects a sample of 9 students who had 5 or nore absences in the school year. The average ACT Composite score for this sample is X = 19 vith s = 4.9. ACT Composite scores are normally distributed with µ = 21.0. Do the data support he claim that the high number of absences hinders the students' ability to perform on tandardized tests, using a = .05? Please show the four-step hypothesis test. %3D

Citrus F v is a popular car rental agency that has a history of having too few cars available, so that its available cars are overdriven. The mean monthly mileage uver the years for Citrus cars has been about 1600 miles per month. Recently, though, Citrus purchased thousands of new cars, and the company claims that the average mileage of its cars is now less than in the past. To test this, a random sample of 21 recent mileages of Citrus cars was taken. The mean of these 21 mileages was 1553 miles per month, and the standard deviation was 241 miles per month. Assume that the population of recent monthly mileages of Citrus cars is normally distributed. At the 0.05 level of significance, can it be concluded that the mean recent monthly mileage, u, of Citrus cars is less than 1600 miles per month? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) (a) State the null…

What is the age distribution of adult shoplifters 21 years ans older in supermarkets? The following is based on information taken from the national retail federation. A random sample of B95 incidents of shoplifting gave the following age distribution. Estimate the mean age, sample variance, and sample standard deviation for the shoplifters. For the class 41 and over use 45.5 as the class midpoint. Round answers to one decimal place.  Find=  X S^2 S   Age range 21-30 31-40 41 and over    Number of shoplifters 261 346 288

What proportion of scores are above z-score of 1.0 in a normal distribution?