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) e Wrap TextGeneralD ab 田、、A、三三三E== E E E Merge & CenterFormat Painter$- % 8UndoClipboard00FontAlignment18fx =FORMULATEXT(G8)NumberAD.26 Life Technologies corp27 Marvell Technology Group, Ltd.28 Methanex Corporation29 Mylan Inc30 New York Times CompanyOfficeMax Inc3 Star3 Star2 Star5 StarAverageVery LowAverageVery LowVery LowAverageAverageAverageAverageHighLow1 Star1 Star4 Star2 Star5 Star3 Star1 Star5 Star4 Star3132 Owens-Corning, Inc.Polaris Industries, Inc.3334 Rio Tinto PLC35 Sempra EnergyStifel Financial Corp.3637Texas Instruments, Inc.Very LowAverageAverageAverageAverage38United Technologies Corp2 Star2 Star5 Star39 Weight Watchers International, Inc.40WR Berkley Corp41Yum Brands Inc42434445464748(4950eData FormulasDataReviewSavedViewHelpTell me what you want to doX CutArial百Copy10A APaste2 Wrap TextFormat PainterBIUD abGeneralUndoE Merge & Center$- % 99ΣAutoSum YClipboard.00ConditionalFormatCell- as Table Styles•FontFormattingInsert Delete Format18f =FORMULATEXT(G8)AlignmentClearSort & Find &NumberFilter SelectTablesCellsEditingAC1.CompanyMorningstar Rating Business Risk2.Ameren Corp5 Star2 Star1 Star2 StarFormula UsedAverageVery LowVery LowVery LowLowApple IncSample Size#N/A4At&T Inc5.Bank of New York Mellon CorpNumber of Stocks (Rating of 5 Stars)#N/A6.BlackRock lInc4 StarPoint Estimate (Rating of 5 Stars)7.Buckeye Partners5 Star#N/AAverageVery LowLow8.Cardinal Health Inc3 StarNumber of Stocks (Low Business Risk)#N/A6.CenturyLink Inc5 Star10Cintas Corporation4 StarAverageVery LowVery LowVery LowVery LowVery LowVery LowAverageAverageVery LowAverageVery LowVery LowAverageHighAverageAverageVery LowPoint Estimate (Low Business Risk)#N/A11Colgate-Palmolive Company4 Star12Corning Inc2 StarNumber of Stocks (Rating of 3 Stars or Less)#N/A13Darden Restaurants Inc2 Star14Discover Financial Services5 StarPoint Estimate (Rating of 3 Stars or Less)#N/A15eBay Inc4 StarEndo Health Solutions1 Star16Fair Isaaac Corp5 Star17Fluor Corp1 Star18Gentex Corporation5 Star4 Star5 Star5 Star5 Star2 Star1 Star3 Star3 Star1920 Group 1 Automotive IncHess Corp2122 Icon PLCInternational Flavors & Fragrances23John Wiley & Sons, Inc.2425 Knight Transportation, Inc.Life Technologies corp26Marvell Technology Group, Ltd.27Help Impro口口口工E.

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Description: 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

The confidence interval is a statistical methodology of assuring a probable bound for a likely event…

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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
Very Low
Very Low
Average
Average
Average
Average
High
Low
1 Star
1 Star
4 Star
2 Star
5 Star
3 Star
1 Star
5 Star
4 Star
31
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
Average
Average
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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50
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Formulas
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Number
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Tables
Cells
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Company
Morningstar Rating Business Risk
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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
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Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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