Ashford RES342 Comprehensive Statistical Analysis: Hypothesis Testing, Regression, ANOVA, and Time Series

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Comprehensive Statistical Analysis: Hypothesis Testing, Regression, ANOVA, and TimeSeriesAshford RES342 Final Exams1) What are the critical z-values for a two-tailed hypothesis test if the significant level = 0.01?A. ± 1.96B. ± 2.33C. ± 2.58D. ±1.652) In classical hypothesis testing, the test statistic is to the critical value what the __________.A. ‘p-value’ is to alphaB. critical value is to alphaC. test statistic is to the ‘p-value’D. level of significance is to the test statistic3) For a hypothesis test of a single population mean at 95% confidence level, a calculated Zscore of 1.7 supports the conclusion thatA. the population mean is greater than the hypothesized valueB. the null hypothesis cannot be rejectedC. the sample is biasedD. the population mean is less than expected4) If the paired differences are normal in a test of mean differences, then the distribution used fortesting is theA. normal distributionB. chi-squareC. student distributionD. F distribution

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5) One hundred women were polled and 60 reported successfully communicating an automobileproblem to an auto repairman. A sample of 150 men had 95 reporting the same success. Thevalue of the test statistic for a test of the equality of proportions isA.-0.5319B. 0.7293C.-0.419D. 0.27026) Weekly sales of iPods® at 20 Best Buy® stores are compared before and after installing anew eye-catching display. To determine if the display is effective in increasing sales, what typeof statistical test would youperform?A. Comparison of means using independent samples using a t-testB. Comparison of proportions using independent samples using a z-testC. Comparison of means using a paired z-testD. Comparison of means using a paired t-test7) When is it appropriate to use the paired difference t-test?A. Four samples are compared at once.B. Any two samples are compared.C. Two independent samples are compared.D. Two dependent samples are compared.8) A survey of hotels found that the average hotel room rate in New Orleans is $88.42 and theaverage room rate in Phoenix is $80.61. The survey sampled 50 hotels in each city. The standarddeviations were $5.62 and $4.83, respectively. At alpha=.05, it can be concluded that there is asignificant different in the rates?A. 7.45B.-1.96C. 1.96D.-7.45

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9) If the paired differences are normal in a test of mean differences, the distribution used fortesting is theA. normal distributionB. chi-squareC. student distributionD. F distribution10) The accountant for Thomas’s Furniture Store is concerned regarding the outstandingreceivable owed the company. There has been a cash flow problem and it is believed that theslow collection of accounts receivable is partially the blame. The accountant believes that 40%of the present accounts are more than 4 months behind in making payments. To be able to makea decision regarding this belief, a random sample of 100 accounts was taken. It was found that 37accounts were more than 4 months late. Did the sample data confirm the accountant’s belief?Use the .05 significant level for the statistical test.A. There is not enough evidence to confirm or deny the belief.B. The accountant's belief is not confirmed.C. The accountant's belief is confirmed.D. The accountant needed to take a larger sample.11) New college business graduates are finding it difficult to get a job. A business journal hasreported that only one in five graduates is able to find a job within 6 months of their graduation.A report by University of Phoenix indicated that out of a survey of 300 recent businessgraduates, 75 had jobs. You are a business major at University of Phoenix and have a concernabout getting a job. Based on this data, will a graduate of University of Phoenix have a betterchance of getting a job in the first 6 months after graduation? Use the .05 significant level for thetest.A. No, there is not a significant difference.B. It cannot be predicted based on this data.C. Yes, there is a significant difference.D. The business journalinformation is incorrect.12) Analysis of variance (ANOVA) is used toA. compare nominal data

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