1. Nine students took the SAT test. Their scores are listed below. Later on, they took...

1. Nine students took the SAT test. Their scores are listed below. Later on, they took a test preparation course and retook the SAT. Their new scores are listed below. Use the Sign test to test the claim that the test preparation has no effect on their scores. Use α = 0.05.

Student	1	2	3	4	5	6	7	8	9
Before	860	820	910	990	1000	930	870	1180	920
After	880	820	900	1030	1030	940	860	1220	940

2. A medical researcher wishes to try three different techniques to lower blood pressure of patients with high blood pressure. The subjects are randomly selected and randomly assigned to one of three groups. Group 1 is given medication, Group 2 is given an exercise program, and Group 3 is assigned a special diet. At the end of six weeks, the reduction in each subject's blood pressure is recorded. Use the Kruskal-Wallis test to test the claim that there is no difference in the distributions of the blood pressures of the three populations. Use α = 0.05.

Group 1	Group 2	Group 3
13 14 11 17 15 10	10 7 4 5 6 2	8 14 6 10 11 6

Solutions

Expert Solution

orchestra answered 1 month ago

Next > < Previous

Related Solutions

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)

nn psychology students took a standardized test. The scores are summarized in the GFDT below. Scores ...

nn psychology students took a standardized test. The scores are summarized in the GFDT below. Scores Frequency 220 - 224 14 225 - 229 15 230 - 234 16 235 - 239 240 - 244 17 245 - 249 40 The scores are also described in the cumulative table shown below. Scores Frequency less than 225 14 less than 230 29 less than 235 45 less than 240 63 less than 245 80 less than 250 nn What is the...

1. The test scores of 10 students are listed below. 32, 69, 77, 82, 100, 68,...

1. The test scores of 10 students are listed below. 32, 69, 77, 82, 100, 68, 88, 95, 75, 80 a. Determine the five-number summary and draw a boxplot for the given data above. Minimum ________ Q1 ________ Median ________ Q3 ________ Maximum ________ b. Which number(s) is suspected outliers? Justify your answer. c. Is it possible to have a mean of 96 if the scores ranged from 65 to 95? Justify your answer.

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...

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 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...

The test scores of 10 students are listed below. 32, 69, 77, 82, 100, 68, 88,...

The test scores of 10 students are listed below. 32, 69, 77, 82, 100, 68, 88, 95, 75, 80 a. Determine the five-number summary and draw a boxplot for the given data above. Minimum ________ Q1 ________ Median ________ Q3 ________ Maximum b. Is there any outlier? Justify your answer. c. Which of the measures of center would be best to represent the data? Justify your answer

A test prep website claims that students who use their service improve their SAT scores by...

A test prep website claims that students who use their service improve their SAT scores by more than 109 points. After using the site, a random sample of 25 students improved by an average of 102 points with a standard deviation of 23.2 points.

Continuing the discussion about SAT scores, these parameters are for all people who took the SAT,...

Continuing the discussion about SAT scores, these parameters are for all people who took the SAT, not just students who went to college. However, there are some assumptions that people with higher SAT scores will make certain choices. One such choice is the decision to go to college. We do not know the data (mean and standard deviation) for students who go to college, but we can estimate it with a sample. We took a random sample of 27 first...

Scores on the SAT Mathematics test are believed to be normally distributed. The scores of a...

Scores on the SAT Mathematics test are believed to be normally distributed. The scores of a simple random sample of five students who recently took the exam are 570, 620, 710, 540 and 480. We want to find a 95% confidence interval of the population mean of SAT math scores. A) Calculate the point estimate. (Round to four decimal places as needed.) B) Calculate the sample standard deviation. (Round to four decimal places as needed.) C) Calculate the standard error...

Subjects