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Having done poorly on a particular exam in a junior high school, 20 students decide to write the exam again to try and improve their mark. Results are given in the following table. Student Attempt 1 (A₁) Attempt 2 (A2) Difference (d = A₁ - A₂) n 20 20 20 0. Average 54 59 -5.0 Standard deviation 3.0 4.8 2.6 (a) Find a 98% confidence interval for the difference in mean scores between attempt 1 and attempt 2. (Round your answers to 4 decimal places, if needed.) (b) Based on this confidence interval, can we conclude there is a difference in mean scores between attempt 1 and attempt 2? Yes, since the interval contains 0. Yes, since the interval is completely below No, since the interval contains 0. O No, since the interval is completely below 0.

Having done poorly on a particular exam in a junior high school, 20 students decide to write the exam again to try and improve their mark. Results are given in the following table. Student Attempt 1 (A₁) Attempt 2 (A2) Difference (d = A₁ - A₂) n 20 20 20 0. Average 54 59 -5.0 Standard deviation 3.0 4.8 2.6 (a) Find a 98% confidence interval for the difference in mean scores between attempt 1 and attempt 2. (Round your answers to 4 decimal places, if needed.) (b) Based on this confidence interval, can we conclude there is a difference in mean scores between attempt 1 and attempt 2? Yes, since the interval contains 0. Yes, since the interval is completely below No, since the interval contains 0. O No, since the interval is completely below 0.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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Having done poorly on a particular exam in a junior high school, 20 students decide to write the exam again to try and improve their mark. Results are given in the following table. Student Attempt 1 (A₁) Attempt 2 (A2) Difference (d = A₁ - A₂) 0. n 0. 20 20 20 Average (a) Find a 98% confidence interval for the difference in mean scores between attempt 1 and attempt 2. (Round your answers to 4 decimal places, if needed.) Check 54 59 -5.0 (b) Based on this confidence interval, can we conclude there is a difference in mean scores between attempt 1 and attempt 2? Yes, since the interval contains 0. Yes, since the interval is completely below Standard deviation 3.0 4.8 2.6 No, since the interval contains 0. No, since the interval is completely below
Transcribed Image Text:Having done poorly on a particular exam in a junior high school, 20 students decide to write the exam again to try and improve their mark. Results are given in the following table. Student Attempt 1 (A₁) Attempt 2 (A2) Difference (d = A₁ - A₂) 0. n 0. 20 20 20 Average (a) Find a 98% confidence interval for the difference in mean scores between attempt 1 and attempt 2. (Round your answers to 4 decimal places, if needed.) Check 54 59 -5.0 (b) Based on this confidence interval, can we conclude there is a difference in mean scores between attempt 1 and attempt 2? Yes, since the interval contains 0. Yes, since the interval is completely below Standard deviation 3.0 4.8 2.6 No, since the interval contains 0. No, since the interval is completely below
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