What is the 95% confidence interval estimate of the mean time it takes an individual to complete a federal income tax return (1 decimal)? ____ to _____ hours
What is the 95% confidence interval estimate of the mean time it takes an individual to complete a federal income tax return (1 decimal)? ____ to _____ hours
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section: Chapter Questions
Problem 22SGR
Related questions
Question
AARP reported on a study conducted to learn how long it takes individuals to prepare their federal income tax return (AARP Bulletin, April 2008). The data contained in the Microsoft Excel Online file below are consistent with the study results. These data provide the time in hours required for a sample of 40 individuals to complete their federal income tax returns. Assume that the population standard deviation is known to be σ = 10 hours.
| Tax Prep Time (hrs) |
| 35.3 |
| 30.5 |
| 37.4 |
| 26.5 |
| 13 |
| 49.9 |
| 28.8 |
| 44 |
| 61.6 |
| 0.5 |
| 40.5 |
| 34.9 |
| 47.9 |
| 36.6 |
| 24.1 |
| 39.8 |
| 47.8 |
| 18.5 |
| 36.6 |
| 39.2 |
| 14.5 |
| 37.3 |
| 40.5 |
| 49.3 |
| 45.5 |
| 28.3 |
| 19.5 |
| 5.6 |
| 52.6 |
| 41.4 |
| 45.3 |
| 39 |
| 33.7 |
| 29.4 |
| 14.5 |
| 40.1 |
| 33.7 |
| 36.9 |
| 5.6 |
| 33.7 |
What is the 95% confidence interval estimate of the mean time it takes an individual to complete a federal income tax return (1 decimal)?
____ to _____ hours
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