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 greater than or equal to 1,089 (already answered) Ha : µ is less than 1,089 (already answered) B. For a sample of 400 individuals who filed a tax return between April 10 and 15, the sample mean refund was $920. Based on prior experience a population standard deviation of σ =$1,800 may be assumed. What is the p-value (to 4 decimals)? C. Using a= 0.05, what is the critical value for the test statistic? Enter negative value as negative number.
Individuals filing federal income tax returns prior to March 31 received an average refund of $1,089. 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 greater than or equal to 1,089 (already answered)
Ha : µ is less than 1,089 (already answered)
B. For a sample of 400 individuals who filed a tax return between April 10 and 15, the sample
C. Using a= 0.05, what is the critical value for the test statistic? Enter negative value as negative number.
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