Question

Many standard statistical methods that you will study in Part II
of this book are intended for use with distributions that are
symmetric and have no outliers. These methods start with the mean
and standard deviation, *x* and *s*. For example,
standard methods would typically be used for the IQ and GPA data
here data215.dat.

(a) Find *x* and *s* for the IQ data. (Round your
answers to two decimal places.)

s=

Here are the numbers

obs gpa iq gender concept 1 9.88 81 2 67 2 10.7 114 2 43 3 7.08 128 2 52 4 4.09 112 2 66 5 8.8 107 1 58 6 7.7 86 2 51 7 7.19 107 2 71 8 4.97 86 2 51 9 9.82 91 1 49 10 8.26 81 2 51 11 9.92 100 1 35 12 9.34 105 1 54 13 8.23 94 2 54 14 6.57 76 1 64 15 10.29 117 1 56 16 10.65 116 1 69 17 2.26 113 1 55 18 7.65 122 1 65 19 6.4 102 2 40 20 10.66 111 1 66 21 8.18 120 2 55 22 10.54 80 2 20 24 5.83 112 1 56 26 10.07 94 2 68 27 10.39 130 1 69 28 5.25 103 2 70 29 10.38 77 2 80 30 9.23 112 2 53 31 5.69 77 2 65 32 8.61 103 1 67 33 10.58 82 1 62 34 8.21 108 1 39 35 8.77 101 2 71 36 5.21 101 2 59 37 9.68 101 1 60 38 5.58 128 2 64 39 10.25 98 2 71 40 4.08 110 1 72 41 10.64 84 1 54 43 6.6 120 2 64 44 8.78 101 2 58 45 8.72 80 2 70 46 8.64 106 2 72 47 10.19 75 2 70 48 7.04 97 2 47 50 8.58 109 2 52 51 8.33 102 1 46 52 10.81 77 2 66 53 6.87 128 2 67 54 10.86 89 2 63 55 7.08 94 2 53 56 8.1 126 2 67 57 5.55 111 2 61 58 7.31 124 1 54 59 1.29 96 1 60 60 8.86 110 1 60 61 8.78 106 2 63 62 9.63 112 2 30 63 6.75 100 2 54 64 7.77 108 2 66 65 6.36 96 2 44 68 6.47 99 2 49 69 10.77 90 1 44 71 7.97 100 2 67 72 9.64 118 1 64 74 5.79 108 2 73 76 9.06 117 2 59 77 7.93 112 1 37 78 9.64 87 1 63 79 8 94 2 36 80 10.29 92 1 64 83 5.28 107 2 42 84 9.24 86 1 28 85 7.7 120 1 60 86 6.57 108 1 70 87 9.68 96 2 51 88 7.21 74 1 21 89 3.94 95 2 56

Answer #1

a.Mean=

b. To find standard deviation create the following table.

data | data-mean | (data -
mean)^{2} |

81 | -20.7949 | 432.42786601 |

114 | 12.2051 | 148.96446601 |

128 | 26.2051 | 686.70726601 |

112 | 10.2051 | 104.14406601 |

107 | 5.2051 | 27.09306601 |

86 | -15.7949 | 249.47886601 |

107 | 5.2051 | 27.09306601 |

86 | -15.7949 | 249.47886601 |

91 | -10.7949 | 116.52986601 |

81 | -20.7949 | 432.42786601 |

100 | -1.7949 | 3.22166601 |

105 | 3.2051 | 10.27266601 |

94 | -7.7949 | 60.76046601 |

76 | -25.7949 | 665.37686601 |

117 | 15.2051 | 231.19506601 |

116 | 14.2051 | 201.78486601 |

113 | 11.2051 | 125.55426601 |

122 | 20.2051 | 408.24606601 |

102 | 0.2051 | 0.04206601 |

111 | 9.2051 | 84.73386601 |

120 | 18.2051 | 331.42566601 |

80 | -21.7949 | 475.01766601 |

112 | 10.2051 | 104.14406601 |

94 | -7.7949 | 60.76046601 |

130 | 28.2051 | 795.52766601 |

103 | 1.2051 | 1.45226601 |

77 | -24.7949 | 614.78706601 |

112 | 10.2051 | 104.14406601 |

77 | -24.7949 | 614.78706601 |

103 | 1.2051 | 1.45226601 |

82 | -19.7949 | 391.83806601 |

108 | 6.2051 | 38.50326601 |

101 | -0.7949 | 0.63186601 |

101 | -0.7949 | 0.63186601 |

101 | -0.7949 | 0.63186601 |

128 | 26.2051 | 686.70726601 |

98 | -3.7949 | 14.40126601 |

110 | 8.2051 | 67.32366601 |

84 | -17.7949 | 316.65846601 |

120 | 18.2051 | 331.42566601 |

101 | -0.7949 | 0.63186601 |

80 | -21.7949 | 475.01766601 |

106 | 4.2051 | 17.68286601 |

75 | -26.7949 | 717.96666601 |

97 | -4.7949 | 22.99106601 |

109 | 7.2051 | 51.91346601 |

102 | 0.2051 | 0.04206601 |

77 | -24.7949 | 614.78706601 |

128 | 26.2051 | 686.70726601 |

89 | -12.7949 | 163.70946601 |

Find the sum of numbers in the last column to get

Refer to the accompanying data set and construct a 95%
confidence interval estimate of the mean pulse rate of adult
females; then do the same for adult males. Compare the results.
Males Females
81
82
72
94
52
57
59
66
51
54
62
80
52
77
74
85
51
89
62
57
73
35
61
64
62
87
80
74
80
79
63
62
63
67
97
76
43
60
85
65
72
86
66
85
73
69
72 ...

Taxpayer
Form 1
Form 2
Form 3
Form 4
1
109
115
126
120
2
98
103
107
108
3
29
27
53
38
4
93
95
103
109
5
62
65
67
64
6
103
107
111
128
7
83
82
101
116
8
122
119
141
143
9
92
101
105
108
10
107
113
127
113
11
103
111
111
108
12
54
64
67
62
13
141
145
142
160
14
92
94
95
102
15...

70, 35, 86, 81, 63, 71, 58, 53, 99, 85, 64, 56, 17, 38, 94, 78,
101, 71, 63, 65, 58, 49, 88, 70, 51, 61, 80, 67, 53, 74, 73, 29,
64, 48, 98, 78, 67, 65, 76, 59, 50, 65, 98, 91, 66, 64, 69, 86, 63,
74. Construct an ungrouped frequency distribution from these data.
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score. the f column will indicate the frequency or...

The authors used a more advanced statistical method than is
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Present hypotheses and conduct the appropriate statistical test to
assess if the intervention and control groups differed in their
Trail Making Test B results at follow-up (see Table 2). Comment on
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#10. You are to determine if a new
online teaching model is better than the existing model, labelled
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students first for material taught the old model and then under the
new model. The data is given in the Excel file and is labelled
problem # 10. Carry out an appropriate procedure in hypothesis
testing to determine if the new model is more effective for
learning.
new
old
78
4
86...

A court administrator wants to examine burglary case disposition
times in his city. A random sample of 50 burglary cases disposed of
during the previous year is drawn. The numbers that follow
represent the number of days needed for each case:
70, 35, 86, 81, 63, 71, 58, 53, 99, 85, 64, 56, 17, 38, 94, 78,
101, 71, 63, 65, 58, 49, 88, 70, 51, 61, 80, 67, 53, 74, 73, 29,
64, 48, 98, 78, 67, 65, 76,...

10
A)
What is the best regression to forecast
salary?
10
C)
Are all variables statistically
significant? Did you drop any
Final
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Work experience
94
92
5
Y
74
90
3
Y
74
87
4
Y
76
84
3
N
66
87
2
N
80
49
4
Y
74
42
3
N
71
61
4
N
84
81
5
N
76
67
5
Y
95
93
4
N
78
56
5
N
71
54
3
Y
82...

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summarize the data for Tax form 2 & 3 and compare their
results. Interpret the findings accurately and present them in a
clear and coherent way. Please explain in depth.
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to complete. The new forms were filled out by 30 different people.
The amount of time (in minutes) taken by each person to complete
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Form 2
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Student Grades
Student
Test
Grade
1
76
62
2
84
90
3
79
68
4
88
84
5
76
58
6
66
79
7
75
73
8
94
93
9
66
65
10
92
86
11
80
53
12
87
83
13
86
49
14
63
72
15
92
87
16
75
89
17
69
81
18
92
94
19
79
78
20
60
71
21
68
84
22
71
74
23
61
74
24
68
54
25
76
97...

Kuya is relocating to China to manage a local branch of world
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determine the provider with the lowest charges, on the average.
Which provider would you advise Kuya to select?
Mobile
Unicom
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62
60
62
55
71
58
69
64
68
58
65
57
56...

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