hw10 - Homework 10 Due Nov 6 1. Individuals filing federal...

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Homework 10 Due Nov 6 1. Individuals filing federal income tax returns prior to March 31 received an average refund of $1056. 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 H will support the research’s contention. 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 experienced a population standard deviation of σ = $1600 may be assumed. What is the p- value? c. At =. α 05 what is your conclusion? d. Construct a conference interval and interpret in 2 ways. 2. Wall Street securities firms paid out record year-end bonuses of $125,000 per employee for 2005 ( Fortune, February 6, 2006). Suppose we would like to take a sample of employees at the Jones &
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hw10 - Homework 10 Due Nov 6 1. Individuals filing federal...

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