Question

In: Statistics and Probability

A standardized exam consists of three parts: math, writing, and critical reading. Sample data showing the...

A standardized exam consists of three parts: math, writing, and critical reading. Sample data showing the math and writing scores for a sample of 12 students who took the exam follow.

Student Math Writing
1 540 474
2 432 380
3 528 463
4 574 612
5 448 414
6 502 526
7 480 430
8 499 453
9 610 615
10 572 541
11 390 335
12 593 613

(a)

Use a 0.05 level of significance and test for a difference between the population mean for the math scores and the population mean for the writing scores. (Use math score − writing score.)

Formulate the hypotheses.

H0: μd = 0

Ha: μd ≠ 0

H0: μd ≠ 0

Ha: μd = 0

    

H0: μd ≤ 0

Ha: μd = 0

H0: μd > 0

Ha: μd ≤ 0

H0: μd ≤ 0

Ha: μd > 0

Calculate the test statistic. (Round your answer to three decimal places.)___

Calculate the p-value. (Round your answer to four decimal places.)

p-value = ____

What is your conclusion?

Reject H0. We cannot conclude that there is a significant difference between the population mean scores for the math test and the writing test.

Do not reject H0. We cannot conclude that there is a significant difference between the population mean scores for the math test and the writing test.     

Reject H0. We can conclude that there is a significant difference between the population mean scores for the math test and the writing test

.Do not reject H0. We can conclude that there is a significant difference between the population mean scores for the math test and the writing test.

(b)

What is the point estimate of the difference between the mean scores for the two tests? (Use math score − writing score.)____

What are the estimates of the population mean scores for the two tests?

Math_____

Writing____

Which test reports the higher mean score?

The math test reports a ( higher or lower) mean score than the writing test.

Solutions

Expert Solution

Answer:-

From the above information we perform two sample t test by using minitab for this we test the hypothesis

Where

is the difference between the population mean scores for the math test and the writing test.

Path :- stat - basis statistics - two sample t test

From the above output

The test statistic , T-value = 0.770

The P-value = 0.4470 at 0.05 level of significance

Decision :- P-value > level of significance , so accept Ho.

Conclusion:- Do not reject H0. We cannot conclude that there is a significant difference between the population mean scores for the math test and the writing test.

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