Description
Instructions: This data analysis assignment will use both StatCrunch applets to simulate random actions and the results from a survey administered to a nationwide random sample of high school students found in our StatCrunch group titled CensusAtSchool. Question 1 1a. Use StatCrunch to construct an appropriately titled and labeled scatterplot with “Armspan_cm” as the explanatory variable and “Height_cm” as the response variable. Copy your scatterplot into your document. 1b. Use Stat-> Summary Stats->Correlation to compute the correlation between “Armspan_cm” and “Height_cm”. Copy the table into your document. 1c. Use StatCrunch to construct an appropriately titled and labeled scatterplot with “Footlength_cm” as the explanatory variable and “Height_cm” as the response variable. Copy your scatterplot into your document. 1d. Use Stat-> Summary Stats->Correlation to compute the correlation between “Footlength_cm” and “Height_cm”. Copy the table into your document. 1e. If you were trying to predict a high school student’s height, would you be able to make a better prediction by knowing the student’s armspan or footlength? Use the scatterplots and correlation values from parts 1a-1d to justify your choice of armspan or footlength by comparing their shapes, trends and strengths. 1f. Use StatCrunch to conduct a regression analysis to predict a student’s height using their armspan. Use Stat->Regression->Simple Linear. Copy only the simple linear regression results (as shown below) into your document.
Explanation & Answer
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Data
Multiple Regression
Y
1
Sl.No. Exports Ones
1
2.6 1
2
2.6 1
3
2.7 1
4
3 1
5
2.9 1
6
3.1 1
7
3.2 1
8
3.7 1
9
3.6 1
10
3.4 1
11
3.7 1
12
3.6 1
13
4.1 1
14
3.5 1
15
4.2 1
16
4.3 1
17
4.2 1
18
4.1 1
19
4.6 1
20
4.4 1
21
4.5 1
22
4.6 1
23
4.6 1
24
4.2 1
25
5.5 1
26
3.7 1
27
4.9 1
28
5.2 1
29
4.9 1
30
4.6 1
31
5.4 1
32
5 1
33
4.8 1
34
5.1 1
35
4.4 1
36
5 1
37
5.1 1
38
4.8 1
39
5.4 1
40
5 1
41
5.2 1
42
4.7 1
43
5.1 1
44
4.9 1
45
4.9 1
46
5.3 1
47
4.8 1
48
4.9 1
X1
M1
5.1
4.9
5.1
5.1
5.1
5.2
5.1
5.2
5.3
5.4
5.7
5.7
5.9
5.8
5.7
5.8
6
6
6
6
6.1
6
6.1
6.7
6.2
6.3
7
7
6.6
6.4
6.3
6.5
6.6
6.8
7.2
7.6
7.2
7.1
7
7.5
7.4
7.4
7.3
7.6
7.8
7.8
8.2
8.2
Exports
X2
Lend
7.8
8
8.1
8.1
8.1
8.1
8.3
8.8
8.9
9.1
9.2
9.5
10.3
10.6
11.3
12.1
12
11.4
11.1
11
11.3
12.6
13.6
13....
Review
Review
