Eight students were given a quiz before & after they took review classes had the following...

Eight students were given a quiz before & after they took review classes had the following ratings:

Before	After
5	6
6	6
4	9
4	6
4	5
5	6
8	9
7	10

What is the critical value at the .05 level of significance?

What is the test statistic?

At an .05 level of significance, can we conclude that the review classes were helpful?

Using the data above, assume that these were scores of two groups of 8 students on the quiz either before or after the review class.

What is the critical value at the .05 level of significance?
What is the test statistic?
At an .05 level of significance, can we conclude that the review classes were helpful

Expert Solution

Ans

Obs	Before	After	d=After - Before	d2
1	5	6	1	1
2	6	6	0	0
3	4	9	5	25
4	4	6	2	4
5	4	5	1	1
6	5	6	1	1
7	8	9	1	1
8	7	10	3	9
SUM =			14	42

orchestra answered 3 years ago

5. Eight students were given a placement test and after a week of classes were given...

5. Eight students were given a placement test and after a week of classes were given again a placement test at the same level. Here are their scores. Before 71 78 80 90 55 65 76 77 After 75 71 89 92 61 68 80 81 (a) Test whether the scores improved after 1 week by performing a student test. (b) Test whether the scores improved after 1 week by performing a sign test.

In a statistics class, 8 students took their pulses before and after an exam. The pulse...

In a statistics class, 8 students took their pulses before and after an exam. The pulse rates (beats per minute) of the students before and after the exam were obtained separately and are shown in the table. Treat this as though it were a random sample of statistics students. Test the hypothesis that the mean of statistics students' pulse rates is higher after an exam using a significance level of 0.05. Do the 5-step hypothesis test and submit an image...

Five university students were given an English achievement test before and after receiving instruction in basic...

Five university students were given an English achievement test before and after receiving instruction in basic grammar. Their scores are shown below: Student Before After A 20 18 B 18 22 C 17 15 D 16 17 E 12 9 Should we conclude that future students would show higher scores after instruction? Use the .05 significance level. Use hypothesis testing.

A test of abstract reasoning is given to a sample of students before and after they...

A test of abstract reasoning is given to a sample of students before and after they completed a formal logic course. Assume that two dependent samples have been randomly selected from normally distributed populations. The results are given below. At the 0.05 significance level, use critical value method to test the claim that the mean score is not affected by the course. Does the course improve the students’ skill on abstract reasoning? Before 74 83 75 88 84 63 93...

A Maths quiz consists of 10 questions were given to a group of students. Each question...

A Maths quiz consists of 10 questions were given to a group of students. Each question has 4 choices. Grade A is given to the students managed to get 70% marks and above. According to the compiled data, 45% of students managed to get grade A. (a) What is the probability that exactly 3 of a random sample of 5 the students were grade A? (b) What is the probability that not more than 7 of a random sample of...

A test of abstract reasoning is given to a random sample of students before and after...

A test of abstract reasoning is given to a random sample of students before and after they completed a formal logic course. The results are given below. Construct a 95% confidence interval for the mean difference in tests scores. Research has shown that the distribution of such differences is approximately normal. Interpret your result. Before 74 83 75 82 80 63 93 84 91 77 After 73 77 70 77 74 67 95 83 84 75

Five students were tested before and after taking a class to improve their study habits. They...

Five students were tested before and after taking a class to improve their study habits. They were given articles to read which contained a known number of facts in each story. After reading the stories, the students listed as many facts as they could recall. The following data were recorded. This a multiple choice question! Before After 10 15 12 14 14 17 16 17 12 20 The degrees of freedom for this sample are ...

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)

16. Cholesterol levels were measured before and after patients were given a drug designed to lower...

16. Cholesterol levels were measured before and after patients were given a drug designed to lower their cholesterol. Test to see if cholesterol dropped with α = 0.01. Patient 1 2 3 4 5 6 7 8 9 10 11 12 13 Before 238 240 220 246 202 222 210 233 204 229 244 220 219 After 235 241 219 235 198 208 202 211 188 201 235 211 207 a) Determine the null and alternative hypotheses for this scenario....

PLEASE TYPE ANSWERS Five students were tested before and after taking a class to improve their...

***PLEASE TYPE ANSWERS*** Five students were tested before and after taking a class to improve their study habits. They were given articles to read which contained a known number of facts in each story. After the story each student listed as many facts as he/she could recall. The following data was recorded. Before 10 12 14 16 12 Atter 15 14 17 17 20 a. What is the alternative hypothesis? b. What is the null hypothesis? c. What is your...

Question