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From previous studies, it is concluded that 85% of phone numbers in a certain city are unlisted. A researcher claims it has decreased and decides to survey 100 adults. Test the researcher's claim at the α = 0.05 significance level. Preliminary: a. Is it safe to assume that n < 0.05 of all subjects in the population? No Yes b. Verify np (1 - p) > 10. Round your answer to one decimal place. np(1 - p) Test the claim: a. Express the null and alternative hypotheses in symbolic form for this claim. Ho: ?> ? ◇ Ha: ?> ? ◇ b. After surveying 100 adult Americans, the researcher finds that 35 phone numbers in a certain city are unlisted. Compute the test statistic. Round to two decimal places. x = c. What is the p-value? Round to 4 decimals. p = d. Make a decision based on a = 0.05 significance level. Reject the null hypothesis. O Do not reject the null hypothesis. e. What is the conclusion? There is sufficient evidence to support the claim that 85% of phone numbers in a certain city are unlisted has decreased. There is not sufficient evidence to support the claim that 85% of phone numbers in a certain city are unlisted has decreased.

From previous studies, it is concluded that 85% of phone numbers in a certain city are unlisted. A researcher claims it has decreased and decides to survey 100 adults. Test the researcher's claim at the α = 0.05 significance level. Preliminary: a. Is it safe to assume that n < 0.05 of all subjects in the population? No Yes b. Verify np (1 - p) > 10. Round your answer to one decimal place. np(1 - p) Test the claim: a. Express the null and alternative hypotheses in symbolic form for this claim. Ho: ?> ? ◇ Ha: ?> ? ◇ b. After surveying 100 adult Americans, the researcher finds that 35 phone numbers in a certain city are unlisted. Compute the test statistic. Round to two decimal places. x = c. What is the p-value? Round to 4 decimals. p = d. Make a decision based on a = 0.05 significance level. Reject the null hypothesis. O Do not reject the null hypothesis. e. What is the conclusion? There is sufficient evidence to support the claim that 85% of phone numbers in a certain city are unlisted has decreased. There is not sufficient evidence to support the claim that 85% of phone numbers in a certain city are unlisted has decreased.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
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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From previous studies, it is concluded that 85% of phone numbers in a certain city are unlisted. A researcher claims it has decreased and decides to survey 100 adults. Test the researcher's claim at the α = 0.05 significance level. Preliminary: a. Is it safe to assume that n < 0.05 of all subjects in the population? No Yes b. Verify np (1 - p) > 10. Round your answer to one decimal place. np(1 - p) Test the claim: a. Express the null and alternative hypotheses in symbolic form for this claim. Ho: ?> ? ◇ Ha: ?> ? ◇ b. After surveying 100 adult Americans, the researcher finds that 35 phone numbers in a certain city are unlisted. Compute the test statistic. Round to two decimal places. x = c. What is the p-value? Round to 4 decimals. p = d. Make a decision based on a = 0.05 significance level. Reject the null hypothesis. O Do not reject the null hypothesis. e. What is the conclusion? There is sufficient evidence to support the claim that 85% of phone numbers in a certain city are unlisted has decreased. There is not sufficient evidence to support the claim that 85% of phone numbers in a certain city are unlisted has decreased.
Transcribed Image Text:From previous studies, it is concluded that 85% of phone numbers in a certain city are unlisted. A researcher claims it has decreased and decides to survey 100 adults. Test the researcher's claim at the α = 0.05 significance level. Preliminary: a. Is it safe to assume that n < 0.05 of all subjects in the population? No Yes b. Verify np (1 - p) > 10. Round your answer to one decimal place. np(1 - p) Test the claim: a. Express the null and alternative hypotheses in symbolic form for this claim. Ho: ?> ? ◇ Ha: ?> ? ◇ b. After surveying 100 adult Americans, the researcher finds that 35 phone numbers in a certain city are unlisted. Compute the test statistic. Round to two decimal places. x = c. What is the p-value? Round to 4 decimals. p = d. Make a decision based on a = 0.05 significance level. Reject the null hypothesis. O Do not reject the null hypothesis. e. What is the conclusion? There is sufficient evidence to support the claim that 85% of phone numbers in a certain city are unlisted has decreased. There is not sufficient evidence to support the claim that 85% of phone numbers in a certain city are unlisted has decreased.
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