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According to the IRS, individuals filing federal income tax returns prior to March 31 received an average refund of $1,066 in 2018 . Consider the population of "last-minute" filers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15 ). a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lower refunds than do early filers. Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention. H0:μ is Ha:μ is b. For a sample of 400 individuals who filed a tax retum between Aprii 10 and 15 , the sample mean refund was $910. Based on prior experience a population standard deviation of σ=$1,600 may be assumed. What is the p-value (to 4 decimals)? c. Using α=0.05, can you conclude that the population mean refund for "last minute" filers is less than the population mean refund for early filers? d. Repeat the preceding hypothesis test using the critical value approach. Using α=0.05, what is the critical value for the test statistic (to 3 decimals)? Enter negative value as negative number. State the rejection rule: Reject H0 if z is the critical value. Using the critical value approach, can you conclude that the population mean fefund for "last minute" filers is less than the population mean refund for early fiters?
Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a particular iandscaping proposal is based on the number of plantings of trees, shrubs, and so on to be used for the project. For cost estimating purposes, managers use two hours of labor time for the planting of a medium-sized tree. Actual times from a sample of 10 plantings during the past month follow (times in hours). 2.43.41.82.92.72.42.61.52.61.62.6 With a 0.05 level of slgnificance, test to see whether the mean tree-planting time differs from two hours. a. State the null and alternative hypotheses. b. Compute the sample mean. (to 2 decimais) c. Compute the sample standard deviation. (to 4 decimals) d. Find the test statistic and p-value. (Use Table 2 in Appendix B.) p-value (to 3 decimals) e. What is your conclusion? We reject the null hypothesis. There enough evidence to prove that the mean tree-planting time differs from
According to the IRS, individuals filing federal income tax returns prior to March 31 received an average refund of $1,066 in 2018 . Consider the population of "last-minute" filers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15 ). a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lower refunds than do early filers. Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention. H0:μ is Ha:μ is b. For a sample of 400 individuals who filed a tax retum between Aprii 10 and 15 , the sample mean refund was $910. Based on prior experience a population standard deviation of σ=$1,600 may be assumed. What is the p-value (to 4 decimals)? c. Using α=0.05, can you conclude that the population mean refund for "last minute" filers is less than the population mean refund for early filers? d. Repeat the preceding hypothesis test using the critical value approach. Using α=0.05, what is the critical value for the test statistic (to 3 decimals)? Enter negative value as negative number. State the rejection rule: Reject H0 if z is the critical value. Using the critical value approach, can you conclude that the population mean fefund for "last minute" filers is less than the population mean refund for early fiters?
According to the IRS, individuals filing federal income tax returns prior to March 31 received an average refund of $1,066 in 2018 . Consider the population of "last-minute" flers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15 ). a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lower refunds than do eariy filers: Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention. H0:μ is Hs:μ is b. For a sample of 400 individuals who filed a tax return between April 10 and 15 , the sample mean refund was $910. Based on prior experience a population standard deviation of σ=$1,600 may be assumed. What is the p-value (to 4 decimais)? c. Using α=0.05. can vou conclude that the population mean refund for "last minute" filers is less than the population mean refund for early filers? d. Repeat the preceding hypothesis test using the critical value approach. Using α=0.05, what is the critical value for the test statistic (to 3 decimals)? Enter negative value as negative number. State the rejection rule: Reject H0 if z Using the critical value approach, can yc filers?
According to the 1RS, individuals filing federal income tax returns prior to March 31 received an average refund of $1,066 in 2018 . Consider the population of "last-minute" flers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15 ). a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lower refunds than do early filers. Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention. H0:μ is Ha:μ is b. For a sample of 400 individuals who fled a tax return between April 10 and 15 , the sample mean refund was $910. Based on prior experience a pepulation standard deviation of σ=$1,600 may be assumed. What is the p-value (to 4 decimais)? c. Using α=0.05, can you conclude that the population mean refund for "last minute" flers is less than the population mean refund for eariy filers? d. Repeat the preceding hypothesis test using the critical value approach. Using α=0.05, what is the critical value for the test statistic (to 3 decimals)? Enter negative value as negative number. State the rejection rule: Reject H0 if z is the critical value. Using the critical value approach, can you conciude that the population mean refund for "last minute" filers is fess than the population mean refund for early filers?