A certain test preparation course is designed to help students improve their scores on the GMAT...

A certain test preparation course is designed to help students improve their scores on the GMAT exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 4 students' scores on the exam after completing the course: 11,13,9,8 Using these data, construct a 90% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal. Step 3: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

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orchestra answered 2 years ago

A certain test preparation course is designed to improve students' SAT Math scores. The students who...

A certain test preparation course is designed to improve students' SAT Math scores. The students who took the prep course have a mean SAT Math score of 526, while the students who did not take the prep course have a mean SAT Math score of 515. Assume that the population standard deviation of the SAT Math scores for students who took the prep course is 44.6 and for students who did not take the prep course is 45.2. The SAT...

An instructor for a test preparation course claims that the course will improve the test scores...

An instructor for a test preparation course claims that the course will improve the test scores of students. The table shows the critical reading scores for 14 students the first two times they took the test. Before taking the test for the second time, the students took the instructor's course to try to improve their critical reading test scores. At a = 0.01, is there enough evidence to support the instructor's claim? Complete parts (a) through (f). number of students:14....

Researchers are always looking for methods to help students improve their mathematics test scores.

Researchers are always looking for methods to help students improve their mathematics test scores. A company recently announced that they have found a way to help college students complete a certain mathematics test more quickly. The company said that using a specific meditation method for 20 minutes, before taking a mathematics test, would help students complete the test more quickly. Researchers have done studies, with thousands of general college students, to see how long it takes them (in minutes)...

24)____________ An SAT prep course claims to improve the test scores of students. The

24)____________ An SAT prep course claims to improve the test scores of students. The table shows the scores for seven students the first two times they took 25)_____________ the verbal SAT. Before taking the SAT for the second time, each student took a course to try to improve his or her verbal SAT scores. Test the claim at a = .05. List the a) null hypothesis b) average difference between the scores Student 1 2...

An SAT prep course claims to improve the test scores of students. The table shows the...

An SAT prep course claims to improve the test scores of students. The table shows the critical reading scores for 10 students the first two times they took the SAT, once before for the course, and once after the course. Test the company’s claim at α = 0.01. Extra columns provided for calculations. Student Score Before Score After 1 308 400 2 456 524 3 352 409 4 433 491 5 306 348 6 471 583 7 422 451 8...

2. A sample of 32 students took a class designed to improve their SAT math scores....

2. A sample of 32 students took a class designed to improve their SAT math scores. Their scores before and after the class are recorded in the sheet ‘SAT Scores’ in the ‘Lab12 Chp 10n11 S20’ spreadsheet. (a) Are the samples independent or paired? (b) Consider constructing a 90% confidence interval for the average increase in scores after taking the class. i. Find the point of estimate using proper notation. Show your work including all relevant quantities needed. Round...

Nine students took the SAT. After taking it, they then took a test preparation course and...

Nine students took the SAT. After taking it, they then took a test preparation course and retook the SAT. Can you conclude that the course changes performance on the SAT? (use α = .1)

Students’ scores on a test in a public administration course follow a normal distribution with a...

Students’ scores on a test in a public administration course follow a normal distribution with a mean of 150 points and a standard deviation of 12. One student who scored 161 on the test and received the grade of B is considering protesting his grade. He feels that the professor did not like him and awarded him a lower grade than his score deserved. The professor disagrees: She maintains that the top 10 percent of scores were given an A,...

Suppose that test scores on the Graduate Management Admission Test (GMAT) are normally distributed with a...

Suppose that test scores on the Graduate Management Admission Test (GMAT) are normally distributed with a mean of 530 and standard deviation of 75. a. What GMAT score separates the highest 15% of the scores from the rest? Do not round intermediate calculations. Round your answer to the nearest whole number. GMAT score = b. What GMAT score corresponds to the 97 percentile? Do not round intermediate calculations. Round your answer to the nearest whole number. GMAT score = c....

To test the effectiveness of a business school preparation course, 8 students took a general business...

To test the effectiveness of a business school preparation course, 8 students took a general business test before and after the course. The results are given below. Student Last Name Score Before Course Score After Course Garcia 670 730 Lam 710 720 Rodriguez 870 860 Torriero 770 800 At the 0.05 level of significance, the conclusion for this hypothesis test is: a Do not reject H0: there is sufficient evidence that the business school preparation course has an impact on...

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