Question

2a. Describe the sample and population you are studying.

**I am studying customers' satisfaction level with their
car insurance plan.**

2b. Calculate the sample mean and sample standard deviation for
your variable. Keep at least four decimal places.

2c. Calculate the standard error and the margin of error for a 90%
confidence interval. Keep at least four decimal places.

Data:

36 |

18 |

66 |

43 |

28 |

39 |

47 |

40 |

24 |

46 |

48 |

57 |

36 |

58 |

39 |

62 |

43 |

65 |

74 |

36 |

39 |

44 |

61 |

50 |

47 |

63 |

60 |

38 |

45 |

51 |

55 |

46 |

68 |

32 |

42 |

38 |

61 |

45 |

31 |

32 |

44 |

30 |

29 |

62 |

49 |

54 |

64 |

38 |

49 |

55 |

28 |

53 |

55 |

52 |

50 |

54 |

76 |

28 |

49 |

70 |

29 |

34 |

77 |

40 |

50 |

40 |

56 |

54 |

36 |

51 |

42 |

71 |

45 |

53 |

55 |

37 |

51 |

36 |

39 |

36 |

51 |

40 |

51 |

52 |

53 |

33 |

66 |

37 |

76 |

67 |

55 |

46 |

Answer #1

a)

sample is random people selected for the study

population is the total customers who has availed the car insurance

b)

sample mean, xbar = 47.837

sample standard deviation, s = 12.8553

c)

sample size, n = 92

SE = 12.8553/sqrt(92) = 1.3403

degrees of freedom, df = n - 1 = 91

Given CI level is 90%, hence α = 1 - 0.9 = 0.1

α/2 = 0.1/2 = 0.05, tc = t(α/2, df) = 1.662

ME = tc * s/sqrt(n)

ME = 1.662 * 12.8553/sqrt(92)

ME = 2.2275

CI = (xbar - tc * s/sqrt(n) , xbar + tc * s/sqrt(n))

CI = (47.837 - 1.662 * 12.8553/sqrt(92) , 47.837 + 1.662 *
12.8553/sqrt(92))

CI = (45.6095 , 50.0645)

Please compute the value, upper control limit, and lower
control limit for the x-bar chart, r-bar chart, p
chart, and np chart.
Sample #
Observations
Defects
1
44
49
44
44
40
0
2
42
46
51
51
42
2
3
45
45
49
49
46
2
4
40
39
42
42
47
7
5
44
51
53
53
44
2
6
41
44
43
43
46
8
7
40
44
46
46
48
3
8
54
49
48
48...

Refer to the Body Measurements Female Data Set and Body
Measurements Male Data Set found in StatDisk (Elementary Stats 12th
Edition, sets #1a and 1b) and use columns 5 for HDL. Use a .05
significance level to test the claim that men and women have the
same mean HDL level (High-Density Lipoprotein) female 74 56 70 40
67 96 43 80 77 41 23 76 39 52 38 37 57 81 37 50 73 61 33 41 60 62
67...

The Whitcomb Company manufactures a metal ring for industrial
engines that usually weighs about 50 ounces. A random sample of 50
of these metal rings produced the following wights (in ounces).
51
53
56
50
44
47
53
53
42
57
46
55
41
44
52
56
50
57
44
46
41
52
69
53
57
51
54
63
42
47
47
52
53
46
36
58
51
38
49
50
62
39
44
55
43
52
43
42
57...

Create a frequency distribution using age and male-yes. It's
supposed to be a bar chart.
Age
55
50
42
47
58
67
64
64
62
43
51
58
42
51
66
69
57
48
51
50
43
46
49
48
55
51
50
41
47
55
54
52
64
68
51
40
53
67
65
47
48
56
64
45
57
50
52
60
66
70
63
63
63
32
70
66
50
67
63
59
63
34
70
50...

The answers are provided. Please provide an
explanation/machanism to support the answers. Questions 1, 3, 13,
14, 19, 21, 25, 27, 30, 32, 33, 34, 37, 38, 39, 42, 43, 44, 45, 46,
47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 61, 62, 63 and 65.
(I know it's a lot, but please do as many as you are willing to.
Thank you! Here is the link to the document:
http://www.kau.edu.sa/Files/0008904/files/41686_g.pdf

What percent of undergraduate enrollment in coed colleges and
universities in the United States is male? A random sample of 50
such institutions give the following data. Percent Males Enrolled
in Coed Universities and Colleges 44 41 41 41 38 50 48 31 52 28 50
42 71 37 43 38 53 51 52 50 47 46 49 50 39 38 58 64 40 54 32 46 48
34 54 48 40 46 42 41 46 42 41 46 54...

How Democratic is Georgia? County-by-county results are shown
for a recent election. For your convenience, the data have been
sorted in increasing order (Source: County and City Data
Book, 12th edition, U.S. Census Bureau).
Percentage of Democratic Vote by Counties in Georgia
31
33
34
34
35
35
35
36
38
38
38
39
40
40
40
40
41
41
41
41
41
41
41
42
42
43
44
44
44
45
45
46
46
46
46
47
48
49...

6) [True or False] Standard deviation can be
negative.
A) TRUE
B) FALSE
7. A random sample of 40 college professors is selected
from all professors at a university.
The following list contains their ages.
65, 45, 44, 38, 55, 55, 49, 42, 43, 22, 52, 58, 52, 38,
56, 34, 53, 36, 50, 36
34,
68, 43, 56, 37, 35, 28, 30, 26, 26, 53, 30, 37, 55,
28, 39, 26, 31, 37, 50
Z score for 55 is?

A national health survey measured the serum HDL cholesterol
levels in a large number of women. Following is a sample of 40 HDL
levels (in milligrams per deciliter) that are based on the results
of that survey. The list has been sorted into numerical order.
25
26
26
26
27
28
28
32
34
34
35
36
36
36
37
38
40
43
44
47
47
48
49
51
52
52
53
54
54
55
57
60
61
65
74...

Q1. A clinical trial is run to assess the effects of
different forms of regular exercise on HDL levels in persons
between the ages of 18 and 29. Participants in the study are
randomly assigned to one of three exercise groups - Weight
training, Aerobic exercise, or Stretching/Yoga – and instructed to
follow the program for 8 weeks. Their HDL levels are measured after
8 weeks and are summarized below.
Weight Training
Aerobic Exercise
Stretching/Yoga
48
38
56
49
41...

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