Inferential Statistics Data Analysis Plan and Computation - Statistics
Part A: Inferential Statistics Data Analysis Plan and Computation
Introduction:
Variables Selected:
Table 1: Variables Selected for Analysis
Variable Name in the Data Set
Variable Type
Description
Qualitative or Quantitative
Variable 1:
Socioeconomic
Marital status
Variable 2:
Expenditure
Total amount of annual expenditures
Variable 3:
Expenditure
Total amount of annual expenditure
Data Set Description and Method Used for Analysis:
Briefly describe the data set, using information provided with data set and write up in Assignment #2. Also describe what method(s) (i.e., free web applets, Excel, TI Calculator) you used to analyze the data.
1. Confidence Interval Analysis: For one expenditure variable, select and run the appropriate method for estimating a parameter, based on a statistic (i.e., confidence interval method) and complete the following table (Note: Format follows Kozak outline):
Table 2: Confidence Interval Information and Results
Name of Variable:
State the Random Variable and Parameter in Words:
Confidence interval method including confidence level and rationale for using it:
State and check the assumptions for confidence interval:
Method Used to Analyze Data:
Find the sample statistic and the confidence interval:
Statistical Interpretation:
2. Hypothesis Testing: Using the second expenditure variable (with socioeconomic variable as the grouping variable for making two groups), select and run the appropriate method for making decisions about two parameters relative to observed statistics (i.e., two sample hypothesis testing method) and complete the following table (Note: Format follows Kozak outline):
Table 3: Two Sample Hypothesis Test Analysis
Research Question:
Two Sample Hypothesis Test that Will Be Used and Rationale for Using It:
State the Random Variable and Parameters in Words:
State Null and Alternative Hypotheses and Level of Significance:
Method Used to Analyze Data:
Find the sample statistic, test statistic, and p-value:
Conclusion Regarding Whether or Not to Reject the Null Hypothesis:
Part B: Results Write Up
Confidence Interval Analysis:
Two Sample Hypothesis Test Analysis:
Discussion:
STAT200 Introduction to Statistics
Dataset for Written Assignments
Description of Dataset:
The data is a random sample from the US Department of Labor’s 2016 Consumer Expenditure Surveys (CE) and provides information about the composition of households and their annual expenditures (
https://www.bls.gov/cex/
). It contains information from 31 households, where a survey responder provided the requested information; it is all self-reported information. This dataset contains four socioeconomic variables (whose names start with SE) and four expenditure variables (whose names start with USD).
Description of Variables/Data Dictionary:
The following table is a data dictionary that describes the variables and their locations in this dataset (Note: Dataset is on second page of this document):
Variable Name
Location in Dataset
Variable Description
Coding
UniqueID#
First Column
Unique number used to identify each survey responder
Each responder has a unique number from 1-30
SE-MaritalStatus
Second Column
Marital Status of Head of Household
Not Married/Married
SE-Income
Third Column
Annual Household Income
Amount in US Dollars
SE-AgeHeadHousehold
Fourth Column
Age of the Head of Household
Age in Years
SE-FamilySize
Fifth Column
Total Number of People in Family (Both Adults and Children)
Number of People in Family
USD-AnnualExpenditures
Sixth Column
Total Amount of Annual Expenditures
Amount in US Dollars
USD-Food
Seventh Column
Total Amount of Annual Expenditure on Food
Amount in US Dollars
USD-Housing
Eighth Column
Total Amount of Annual Expenditure on Housing
Amount in US Dollars
USD-Transport
Ninth Column
Total Amount of Annual Expenditure on Transportation
Amount in US Dollars
How to read the data set: Each row contains information from one household. For instance, the first row of the dataset starting on the next page shows us that for the first household in the sample: the head of household is not married and is 35 years old, has an annual household income is $97,469, has a family size of 4, annual expenditures of $54,929, and spends $6,900 on food, $18,514 on housing, and $145 on transportation.
UniqueID#
SE-MaritalStatus
SE-Income
SE-AgeHeadHousehold
SE-FamilySize
USD-AnnualExpenditures
USD-Food
USD-Housing
USD-Transport
1
Not Married
97469
35
4
54929
6900
18514
145
2
Not Married
97912
49
1
55704
6937
18619
152
3
Not Married
96697
49
2
56453
6971
18520
136
4
Not Married
96653
51
4
56488
6943
18838
124
5
Not Married
96664
53
3
55558
7051
18502
168
6
Not Married
95744
52
4
55963
7040
18435
146
7
Not Married
94929
59
2
55247
6948
18483
133
8
Not Married
96928
43
3
55932
6953
18701
145
9
Not Married
97681
53
4
56124
7097
18676
134
10
Not Married
96244
56
4
56051
7073
18484
141
11
Not Married
96886
44
2
55321
6982
18312
153
12
Not Married
96727
39
2
56440
7051
18376
120
13
Not Married
96690
57
2
56097
6822
18334
135
14
Not Married
96572
59
2
56515
7179
18648
123
15
Not Married
98717
40
3
56393
7036
18389
114
16
Married
106292
57
4
82299
10983
23063
132
17
Married
95801
54
3
73798
9395
23155
151
18
Married
95385
50
4
74110
9101
22847
211
19
Married
95865
46
1
74789
9321
22621
168
20
Married
109312
37
6
80801
10564
25392
58
21
Married
114051
42
5
84486
10820
25728
167
22
Married
110651
58
4
83766
11226
22899
113
23
Married
107338
67
2
83651
11710
21893
47
24
Married
101829
45
4
82385
10821
22409
121
25
Married
102244
34
4
74687
8735
27964
60
26
Married
113558
31
5
79861
10346
25006
141
27
Married
100947
35
4
73973
8455
26783
36
28
Married
107369
66
2
83441
11724
23174
82
29
Married
106894
51
5
81585
11360
22396
162
30
Married
97769
47
5
73950
9035
22867
202
31
Married
98885
45
4
57795
9653
23400
152
Assignment #3: Inferential Statistics Analysis and Writeup
Part A: Inferential Statistics Data Analysis Plan and Computation
Introduction:
Variables Selected:
Table 1: Variables Selected for Analysis
Variable Name in the Data Set
Variable Type
Description
Qualitative or Quantitative
Variable 1:
Socioeconomic
Marital status
Variable 2:
Expenditure
Total amount of annual expenditures
Variable 3:
Expenditure
Total amount of annual expenditure
Data Set Description and Method Used for Analysis:
Briefly describe the data set, using information provided with data set and write up in Assignment #2. Also describe what method(s) (i.e., free web applets, Excel, TI Calculator) you used to analyze the data.
1. Confidence Interval Analysis:
For one expenditure variable, select and run the appropriate method for estimating a parameter, based on a statistic (i.e., confidence interval method) and complete the following table (Note: Format follows Kozak outline):
Table 2: Confidence Interval Information and Results
Name of Variable:
State the Random Variable and Parameter in Words:
Confidence interval method including confidence level and rationale for using it:
State and check the assumptions for confidence interval:
Method Used to Analyze Data:
Find the sample statistic and the confidence interval:
Statistical Interpretation:
2. Hypothesis Testing:
Using the second expenditure variable (with socioeconomic variable as the grouping variable for making two groups), select and run the appropriate method for making decisions about two parameters relative to observed statistics (i.e., two sample hypothesis testing method) and complete the following table (Note: Format follows Kozak outline):
Table 3: Two Sample Hypothesis Test Analysis
Research Question:
Two Sample Hypothesis Test that Will Be Used and Rationale for Using It:
State the Random Variable and Parameters in Words:
State Null and Alternative Hypotheses and Level of Significance:
Method Used to Analyze Data:
Find the sample statistic, test statistic, and p-value:
Conclusion Regarding Whether or Not to Reject the Null Hypothesis:
Part B: Results Write Up
Confidence Interval Analysis:
Two Sample Hypothesis Test Analysis:
Discussion:
STAT200: Assignment #3 - Inferential Statistics Analysis and Writeup
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