What is the 95% Confidence interval estimate of the mean time it takes an individual to complete a federal income tax return? (1 decimal)

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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 as o=10 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)  

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26 Life Technologies corp
27 Marvell Technology Group, Ltd.
28 Methanex Corporation
29 Mylan Inc
30 New York Times Company
OfficeMax Inc
3 Star
3 Star
2 Star
5 Star
Average
Very Low
Average
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Very Low
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Average
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Average
High
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1 Star
4 Star
2 Star
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3 Star
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32 Owens-Corning, Inc.
Polaris Industries, Inc.
33
34 Rio Tinto PLC
35 Sempra Energy
Stifel Financial Corp.
36
37Texas Instruments, Inc.
Very Low
Average
Average
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38
United Technologies Corp
2 Star
2 Star
5 Star
39 Weight Watchers International, Inc.
40
WR Berkley Corp
41
Yum Brands Inc
42
43
44
45
46
47
48
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2.
Ameren Corp
5 Star
2 Star
1 Star
2 Star
Formula Used
Average
Very Low
Very Low
Very Low
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Apple Inc
Sample Size
#N/A
4
At&T Inc
5.
Bank of New York Mellon Corp
Number of Stocks (Rating of 5 Stars)
#N/A
6.
BlackRock lInc
4 Star
Point Estimate (Rating of 5 Stars)
7.
Buckeye Partners
5 Star
#N/A
Average
Very Low
Low
8.
Cardinal Health Inc
3 Star
Number of Stocks (Low Business Risk)
#N/A
6.
CenturyLink Inc
5 Star
10
Cintas Corporation
4 Star
Average
Very Low
Very Low
Very Low
Very Low
Very Low
Very Low
Average
Average
Very Low
Average
Very Low
Very Low
Average
High
Average
Average
Very Low
Point Estimate (Low Business Risk)
#N/A
11
Colgate-Palmolive Company
4 Star
12
Corning Inc
2 Star
Number of Stocks (Rating of 3 Stars or Less)
#N/A
13
Darden Restaurants Inc
2 Star
14
Discover Financial Services
5 Star
Point Estimate (Rating of 3 Stars or Less)
#N/A
15
eBay Inc
4 Star
Endo Health Solutions
1 Star
16
Fair Isaaac Corp
5 Star
17
Fluor Corp
1 Star
18
Gentex Corporation
5 Star
4 Star
5 Star
5 Star
5 Star
2 Star
1 Star
3 Star
3 Star
19
20 Group 1 Automotive Inc
Hess Corp
21
22 Icon PLC
International Flavors & Fragrances
23
John Wiley & Sons, Inc.
24
25 Knight Transportation, Inc.
Life Technologies corp
26
Marvell Technology Group, Ltd.
27
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Transcribed Image Text:Formulas Data Review Saved View Help Tell me what you want to do X Cut Arial 百Copy 10 A A Paste 2 Wrap Text Format Painter BIUD ab General Undo E Merge & Center $- % 99 Σ AutoSum Y Clipboard .00 Conditional Format Cell - as Table Styles• Font Formatting Insert Delete Format 18 f =FORMULATEXT(G8) Alignment Clear Sort & Find & Number Filter Select Tables Cells Editing A C 1. Company Morningstar Rating Business Risk 2. Ameren Corp 5 Star 2 Star 1 Star 2 Star Formula Used Average Very Low Very Low Very Low Low Apple Inc Sample Size #N/A 4 At&T Inc 5. Bank of New York Mellon Corp Number of Stocks (Rating of 5 Stars) #N/A 6. BlackRock lInc 4 Star Point Estimate (Rating of 5 Stars) 7. Buckeye Partners 5 Star #N/A Average Very Low Low 8. Cardinal Health Inc 3 Star Number of Stocks (Low Business Risk) #N/A 6. CenturyLink Inc 5 Star 10 Cintas Corporation 4 Star Average Very Low Very Low Very Low Very Low Very Low Very Low Average Average Very Low Average Very Low Very Low Average High Average Average Very Low Point Estimate (Low Business Risk) #N/A 11 Colgate-Palmolive Company 4 Star 12 Corning Inc 2 Star Number of Stocks (Rating of 3 Stars or Less) #N/A 13 Darden Restaurants Inc 2 Star 14 Discover Financial Services 5 Star Point Estimate (Rating of 3 Stars or Less) #N/A 15 eBay Inc 4 Star Endo Health Solutions 1 Star 16 Fair Isaaac Corp 5 Star 17 Fluor Corp 1 Star 18 Gentex Corporation 5 Star 4 Star 5 Star 5 Star 5 Star 2 Star 1 Star 3 Star 3 Star 19 20 Group 1 Automotive Inc Hess Corp 21 22 Icon PLC International Flavors & Fragrances 23 John Wiley & Sons, Inc. 24 25 Knight Transportation, Inc. Life Technologies corp 26 Marvell Technology Group, Ltd. 27 Help Impro 口口口 工 E.
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