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TECH 10.56 Internet book prices Anna's project for her introduc- tory statistics course was to compare the selling prices of textbooks at two Internet bookstores. She first took a random sample of 10 textbooks used that term in courses at her college, based on the list of texts compiled by the college bookstore. The prices of those textbooks at the two Internet sites were Site A: $115, $79, $43, $140, $99, $30, $80, $99, $119, $69 Site B: $110, $79, $40, $129, $99, $30, $69, $99, $109, $66 a. Are these independent samples or dependent samples? Justify your answer. b. Find the mean for each sample. Find the mean of the difference scores. Compare and interpret. c. Using software or a calculator, construct a 90% confidence interval comparing the population mean prices of all textbooks used that term at her college. Interpret.

TECH 10.56 Internet book prices Anna's project for her introduc- tory statistics course was to compare the selling prices of textbooks at two Internet bookstores. She first took a random sample of 10 textbooks used that term in courses at her college, based on the list of texts compiled by the college bookstore. The prices of those textbooks at the two Internet sites were Site A: $115, $79, $43, $140, $99, $30, $80, $99, $119, $69 Site B: $110, $79, $40, $129, $99, $30, $69, $99, $109, $66 a. Are these independent samples or dependent samples? Justify your answer. b. Find the mean for each sample. Find the mean of the difference scores. Compare and interpret. c. Using software or a calculator, construct a 90% confidence interval comparing the population mean prices of all textbooks used that term at her college. Interpret.

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
Section: Chapter Questions
Problem 25SGR
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Aa A DA ed States) # B 描く描く AL AaBbCcDdE AaBbCcDdE AaBb CcD AaBbCcDdE AaBI SE Normal No Spacing Heading 1 Heading 2 Title ✓ d. Using only the interval calculated in part (c), can you conclude that the mean textbook price is lower at one of the stores? Explain why or why not. e. What significance level did you use in part (d)? f. Use software to construct an appropriate plot to estimate the population distribution and paste below. Is there any reason to believe that statistical inferences will be unreliable for these data? Explain why or why not. X Focus MacBook Pro I U 06 A ¶ !!! pe E
Transcribed Image Text:Aa A DA ed States) # B 描く描く AL AaBbCcDdE AaBbCcDdE AaBb CcD AaBbCcDdE AaBI SE Normal No Spacing Heading 1 Heading 2 Title ✓ d. Using only the interval calculated in part (c), can you conclude that the mean textbook price is lower at one of the stores? Explain why or why not. e. What significance level did you use in part (d)? f. Use software to construct an appropriate plot to estimate the population distribution and paste below. Is there any reason to believe that statistical inferences will be unreliable for these data? Explain why or why not. X Focus MacBook Pro I U 06 A ¶ !!! pe E
10.56 Internet book prices Anna's project for her introduc- TECH tory statistics course was to compare the selling prices of textbooks at two Internet bookstores. She first took a random sample of 10 textbooks used that term in courses at her college, based on the list of texts compiled by the college bookstore. The prices of those textbooks at the two Internet sites were Site A: $115, $79, $43, $140, $99, $30, $80, $99, $119, $69 Site B: $110, $79, $40, $129, $99, $30, $69, $99, $109, $66 a. Are these independent samples or dependent samples? Justify your answer. b. Find the mean for each sample. Find the mean of the difference scores. Compare and interpret. c. Using software or a calculator, construct a 90% confidence interval comparing the population mean prices of all textbooks used that term at her college. Interpret.
Transcribed Image Text:10.56 Internet book prices Anna's project for her introduc- TECH tory statistics course was to compare the selling prices of textbooks at two Internet bookstores. She first took a random sample of 10 textbooks used that term in courses at her college, based on the list of texts compiled by the college bookstore. The prices of those textbooks at the two Internet sites were Site A: $115, $79, $43, $140, $99, $30, $80, $99, $119, $69 Site B: $110, $79, $40, $129, $99, $30, $69, $99, $109, $66 a. Are these independent samples or dependent samples? Justify your answer. b. Find the mean for each sample. Find the mean of the difference scores. Compare and interpret. c. Using software or a calculator, construct a 90% confidence interval comparing the population mean prices of all textbooks used that term at her college. Interpret.
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