According to the IRS, individuals filing federal income tax returns prior to March 31 received an average refund of $1,078 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). b. For a sample 400 of 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 a=1,800 may be assumed. What is the p -value (to 4 decimals)? c. Using , can you conclude that the population mean refund for "last minute" filers is less than the population mean refund for early filers? yes or no d. Repeat the preceding hypothesis test using the critical value approach. Using a=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 if is the critical value. choices: greater than or equal to, greater than, less than or equal to, less than, equal to , not equal to Using the critical value approach, can you conclude that the population mean refund for "last minute" filers is less than the population mean refund for early filers? yes or no
According to the IRS, individuals filing federal income tax returns prior to March 31 received an average refund of $1,078 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).
b. For a sample 400 of 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 a=1,800 may be assumed. What is the p -value (to 4 decimals)?
c. Using , can you conclude that the population mean refund for "last minute" filers is less than the population mean refund for early filers? yes or no
d. Repeat the preceding hypothesis test using the critical value approach.
Using a=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 if is the critical value. choices: greater than or equal to, greater than, less than or equal to, less than, equal to , not equal to
Using the critical value approach, can you conclude that the population mean refund for "last minute" filers is less than the population mean refund for early filers? yes or no
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is it p=value is suppose to be 0.0401 not 0.0395 to according z-table of -1.75
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