What is the 95% Confidence interval estimate of the mean time it takes an individual to complete a federal income tax return? (1 decimal)
What is the 95% Confidence interval estimate of the mean time it takes an individual to complete a federal income tax return? (1 decimal)
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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 as o=10 hours.
What is the 95% Confidence
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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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General
D ab 田、、A、三三三
E== E E E Merge & Center
Format Painter
$- % 8
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Clipboard
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Font
Alignment
18
fx =FORMULATEXT(G8)
Number
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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
(49
50
eData
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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
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E."
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
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工
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