After a large fund drive to help the Boston City Library, the following information was obtained from a random sample of contributors to the library fund. Using a 1% level of sgnificance, test the claim that the amount contrbuted to the library fund is independent of ethnic group. Number of People Making Contribution $101-150 46 Ethnic Group S1-50 Over $200 20 25 28 31 104 $51-100 $151-200 Row Total 79 69 37 251 97 52 63 27 264 266 340 1121 83 60 58 37 99 85 266 53 72 239 Column Total 358 154 (a) What is the level of significance? State the null and alternate hypotheses. O Hg: Contribution level and ethnic group are not independent. H: Contribution level and ethnic group are independent. O Hg: Contribution level and ethnic group are independent. H: Contribution level and ethnic group are independent. O Hg: Contribution level and ethnic group are not independent. H: Contribution level and ethnic group are not independent. O Hg: Contribution level and ethnic group are independent. H: Contribution level and ethnic group are not independent. (b) Find the value of the chi-square statistic for the sample. (Round the expected frequencies to at least three decimal places. Round the test statistic to three decimal places.) Are all the expected frequencies greater than 57 O Yes O No What sampling distribution will you use? O uniform O binomial O Student's t O hi-square O normal What are the degrees of freedom? (c) Find or estimate the Pvalue of the sample test statistic. (Round your answer to three decimal places.) (4) Based on your answers in parts (a) to (c), will you reject or fail to reject the nul hypothesis of independence? O Since the Pvalue > a, we fal to reject the null hypothesis. O Snce the Pvalue > a, we reject the null hypothesis. O Since the Pvalue sa, we reject the null hypothesis. O Since the Pvalue sa, we fal to reject the null hypothesis. (e) Interpret your condusion in the context of the application. O At the 1% level of significance, there is sufficient evidence to condude that contribution level and ethnic group are not independent. O At the 1% level of significance, there is insufficent evidence to conclude that contribution level and ethnic group are not independent.

After a large fund drive to help the Boston City Library, the following information was obtained from a random sample of contributors to the library fund. Using a 1% level of sgnificance, test the claim that the amount contrbuted to the library fund is independent of ethnic group. Number of People Making Contribution $101-150 46 Ethnic Group S1-50 Over $200 20 25 28 31 104 $51-100 $151-200 Row Total 79 69 37 251 97 52 63 27 264 266 340 1121 83 60 58 37 99 85 266 53 72 239 Column Total 358 154 (a) What is the level of significance? State the null and alternate hypotheses. O Hg: Contribution level and ethnic group are not independent. H: Contribution level and ethnic group are independent. O Hg: Contribution level and ethnic group are independent. H: Contribution level and ethnic group are independent. O Hg: Contribution level and ethnic group are not independent. H: Contribution level and ethnic group are not independent. O Hg: Contribution level and ethnic group are independent. H: Contribution level and ethnic group are not independent. (b) Find the value of the chi-square statistic for the sample. (Round the expected frequencies to at least three decimal places. Round the test statistic to three decimal places.) Are all the expected frequencies greater than 57 O Yes O No What sampling distribution will you use? O uniform O binomial O Student's t O hi-square O normal What are the degrees of freedom? (c) Find or estimate the Pvalue of the sample test statistic. (Round your answer to three decimal places.) (4) Based on your answers in parts (a) to (c), will you reject or fail to reject the nul hypothesis of independence? O Since the Pvalue > a, we fal to reject the null hypothesis. O Snce the Pvalue > a, we reject the null hypothesis. O Since the Pvalue sa, we reject the null hypothesis. O Since the Pvalue sa, we fal to reject the null hypothesis. (e) Interpret your condusion in the context of the application. O At the 1% level of significance, there is sufficient evidence to condude that contribution level and ethnic group are not independent. O At the 1% level of significance, there is insufficent evidence to conclude that contribution level and ethnic group are not independent.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 8E

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