o determine if his teaching method increases students’ learning, a professor administers a pretest to his class at the beginning of the semester and then a posttest at the end of the semester. The results from 10 randomly chosen students are given below. Let Population 1 be the Pretest scores and Population 2 be the Posttest scores. Test Scores Pretest Posttest 83 71 73 72 82 81 81 57 97 88 57 56 53 51 68 59 57 60 90 84 Step 2 of 2 : Interpret the confidence interval obtained in Step 1. 1. We are 90% confident that the mean increase in students scores from the pretest to the post test is between 1.7 and 10.7 points for the population of students in this professors class. 2. Since the confidence interval contains zero, the data do not provide evidence of a significant increase in students scores using the professors teaching method at a 90% confident level. 3. Since the confidence interval does not contain zero, the data provides evidence of a significant increase in students scores using the professors teaching method at a 90% confident level. 4. We are 90% confident that the mean decrease in students scores from the pretest to the post test is between 1.7 and 10.7 points for the population of students in this professors class.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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To determine if his teaching method increases students’ learning, a professor administers a pretest to his class at the beginning of the semester and then a posttest at the end of the semester. The results from 10 randomly chosen students are given below. Let Population 1 be the Pretest scores and Population 2 be the Posttest scores.

Test Scores

Pretest	Posttest
83	71
73	72
82	81
81	57
97	88
57	56
53	51
68	59
57	60
90	84

Step 2 of 2 : Interpret the confidence interval obtained in Step 1.

1. We are 90% confident that the mean increase in students scores from the pretest to the post test is between 1.7 and 10.7 points for the population of students in this professors class.

2. Since the confidence interval contains zero, the data do not provide evidence of a significant increase in students scores using the professors teaching method at a 90% confident level.

3. Since the confidence interval does not contain zero, the data provides evidence of a significant increase in students scores using the professors teaching method at a 90% confident level.

4. We are 90% confident that the mean decrease in students scores from the pretest to the post test is between 1.7 and 10.7 points for the population of students in this professors class.

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