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 | 468 |
2 | 432 | 374 |
3 | 528 | 463 |
4 | 574 | 612 |
5 | 448 | 420 |
6 | 502 | 526 |
7 | 480 | 430 |
8 | 499 | 459 |
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?
-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.
-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 cannot conclude that there is a significant difference between the population mean scores for the math test and the writing test.
-Reject H0. We cannot 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___
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