Logan and Brian began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Logan took a test in Art History and earned a 76.8, and Brian took a test in English and earned a 68.9. Use the fact that all the students' test grades in the Art History class had a mean of 71.9 and a standard deviation of 11.6, and all the students' test grades in English had a mean of 61 and a standard deviation of 9.4 to answer the following questions. a) Calculate the z-score for Logan's test grade. z=z= [Round your answer to two decimal places.] b) Calculate the z-score for Brian's test grade. z=z= [Round your answer to two decimal places.] c) Which person did relatively better? Logan Brian They did equally well.

A human resources manager for a company had a choice of how to administer an aptitude test for employee recruits. The New form of the test was administered via computer. The Old form had the same content, but was delivered via paper and pencil. The manager wanted to know if the tests were equivalent in terms of mean scores. If they were equivalent, the manager could give the test by either method, but if they were not equivalent, the manager would have to stick with one administration method in order to be fair to all recruits taking the test. The manager formed his hypotheses, and set an alpha level of .05. The results of a hypothesis test using the two administration methods is shown below. What should the manager do? t-Test: Two-Sample Assuming Equal Variances New Old Mean 15 11.1 13.33333 18.76667 Variance Observations 10 10 Pooled Variance 16.05 Hypothesized Mean Difference df 18 t Stat 2.176768 P(T<=t) one-tail t Critical one-tail 0.021526 1.734064 P(T<=t) two-tail t Critical…

On a nationwide math test, the mean was 57 and the standard deviation was 4. If Roberto scored 90, what was his z-score?

Lucas and Alex began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Lucas took a test in Math and earned a 73.4, and Alex took a test in English and earned a 70.5. Use the fact that all the students' test grades in the Math class had a mean of 74.1 and a standard deviation of 11.3, and all the students' test grades in English had a mean of 60.9 and a standard deviation of 8.1 to answer the following questions.a) Calculate the z-score for Lucas's test grade.z=z=b) Calculate the z-score for Alex's test grade.z=z=

Before going to college, Chelsea wanted to see if she could sell her old car online. She selected a sample of the prices on 25 similar cars sold online in the past month. Later, Chelsea realized that the lowest-priced car in the sample was mistakenly recorded as half the price it actually sold for. However, after correcting the error, the corrected price was still less than or equal to any other car price in her sample. Which of the following sample statistics must have remained the same after the correction was made? Select one: 1.Range 2.Median 3.Mode 4.Variance 5.Mean

Suppose that the mean score of a class of 34 students was 78. The 19 male students in the class had a mean score of 66. What was the mean score for the 15 female students? Mean Score for Female Students

On a verbal skill test, the mean was 72 and the standard deviation was 7. If John scored 75, what was his z-score?

April and Heather began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. April took a test in Science and earned a 74.4, and Heather took a test in English and earned a 69.7. Use the fact that all the students' test grades in the Science class had a mean of 71.3 and a standard deviation of 8.9, and all the students' test grades in English had a mean of 60.5 and a standard deviation of 8.5 to answer the following questions. a) Calculate the z-score for April's test grade. b) Calculate the z-score for Heather's test grade. c) Which person did relatively better? April Heather O They did equally well. Submit Question logi $22 *3 F4 F8 7. 8. %4

The local pilots association examined records from this year's census of its members. Tom is a member, and the census shows that he has 4210 hours of flight experience. The census also shows that among all members of the association the mean flight experience is 3095 hours with a standard deviation of 679 hours. Find the z-score of Tom's flight experience relative to the flight experiences of all the members of the pilots association. Round your answer to two decimal places.

A golf pro claims that his mean golf score is 63. A sportswriter wants to test the claim that his mean score is higher 63. Would this be a left-tailed, right-tailed, or two-tailed test?