Question
In: Statistics and Probability
1.) Ten men were selected to test an exercise device by using it 4 times per...
1.) Ten men were selected to test an exercise device by using it 4 times per week for 30 minutes. Their resting pulse rates (beats per minute) were measured before the test began, and then again after 6 weeks. Assume the differences are approximately normally distributed.
a.) At significance level ? = .05, is there sufficient evidence to conclude that exercising in this way can reduce resting pulse rates?
b.) Give a 95% confidence interval for the mean difference. Interpret your interval in context.
Subject Before After
Allen 73 73
Brandon 83 79
Carlos 85 81
David 87 86
Erwin 91 86
Frank 98 91
George 87 84
Hans 85 83
Ivan 83 84
James 79 76
Solutions
orchestra answered 2 years agoRelated Solutions
Ten males and ten females were interviewed for a mid-level management position and their interview times...
Ten males and ten females were interviewed for a mid-level
management position and their interview times were recorded in
minutes . Shown below are descriptive statistics for the males and
females. Your task is to determine of there was a significant
difference in the average length of the interviews given to men and
women.
Males. Females
N1=10
N2=10
M1=36.5
M2=37.5 (Upper-case M's ate used here in place of
X-bar symbols for means
S21=25.5. S22=25.3
(These are the sample variances)...
MEN Time (minutes and seconds) Exercise per Week Favorite Exercise 1 1:48 6 Running 2 1:11...
MEN
Time
(minutes and seconds)
Exercise per Week
Favorite Exercise
1
1:48
6
Running
2
1:11
4
Walking
3
0:32
2
Push up
4
0:47
3
Jumping Jacks
5
0:18
0
n/a
WOMEN
Time
(minutes and seconds)
Exercise per week
Favorite Exercise
1
0:35
2
Squats
2
1:20
3
Elliptical machine
3
1:14
5
Squats
4
1:09
0
n/a
STEP 3: You will analyze your data and compute the following
statistics for each group:
1) The Mean and standard deviation...
(1 point) Ten randomly selected people took an IQ test A, and next day they took...
(1 point) Ten randomly selected people took an IQ test A, and
next day they took a very similar IQ test B. Their scores are shown
in the table below.
Person
A
B
C
D
E
F
G
H
I
J
Test A
113
88
96
72
107
87
126
101
112
95
Test B
112
86
98
72
105
86
129
99
110
93
1. Consider (Test A - Test B). Use a 0.010.01 significance level to
test the...
The age x and resting heart rate y were measured for ten men, with the results...
The age x and resting heart rate
y were measured for ten men, with the
results shown in the table.
x
20
23
30
37
35
45
51
55
60
63
y
72
71
73
74
74
73
72
79
75
77
Test, at 10% level of significance, whether age is useful for
predicting resting heart rate.
H0:
Ha:
t-Test Statistic (round to three decimal
places) =
Critical t-score (t αt α or t α / 2t α / 2,...
Ten corvettes between 1 and 6 years old were randomly selected from the classified ads of...
Ten corvettes between 1 and 6 years old were randomly selected
from the classified ads of The Arizona Republic. The following data
were obtained, where x denotes age, in years, and y denotes price,
in hundreds of dollars.
X: 6 6 6 2 2 5 4 5 1 4
Y: 270 260 275 405 364 295 335 308 405 305
(A) Draw a scatter diagram
(B) Find the Linear Correlation coefficient r.
(C) Describe the shape, strength, and direction.
(D)...
Ten randomly selected people took an IQ test A, and the next day they took a...
Ten randomly selected people took an IQ test A, and the next day
they took a very similar IQ test B. Their scores are shown in the
table below.
Person
A
B
C
D
E
F
G
H
I
J
Test A
113
122
89
96
80
94
110
85
105
102
Test B
120
123
87
99
80
95
110
88
105
102
1. Consider (Test A - Test B). Use a 0.01 significance level to
test the claim...
Exercise 11-21 (LO11-2) A recent study focused on the number of times men and women who...
Exercise 11-21 (LO11-2) A recent study focused on the number of
times men and women who live alone buy take-out dinner in a month.
Assume that the distributions follow the normal probability
distribution and the population standard deviations are equal. The
information is summarized below. Statistic Men Women Sample mean
24.26 22.45 Sample standard deviation 5.91 4.88 Sample size 35 39
At the 0.01 significance level, is there a difference in the mean
number of times men and women order...
2,000 men were enrolled in a study. They were followed by investigators for 4 years. Each...
2,000 men were enrolled in a study. They were followed by
investigators for 4 years. Each year, the men were tested for
prostate cancer. After yr 1 , there were no cases, but 20 men were
lost to follow up. After 2nd year, there were 10 cases of cancer
and 25 men were lost to follow up. At the end of the 3rd year,
there were 16 cases and 3 men were lost. At the end of the 4th
year,...
Ten randomly selected people took an IQ test A, and next day they took a very...
Ten randomly selected people took an IQ test A, and next day
they took a very similar IQ test B. Their scores are shown in the
table below.
Person
A
B
C
D
E
F
G
H
I
J
Test A
81
105
91
116
102
74
95
122
99
112
Test B
84
105
89
122
103
77
98
122
102
116
1. Consider (Test A - Test B). Use a 0.050.05 significance level to
test the claim that...
Ten randomly selected people took an IQ test A, and next day they took a very...
Ten randomly selected people took an IQ test A, and next day
they took a very similar IQ test B. Their scores are shown in the
table below.
Person A B C D E F G H I J
Test A 123 97 112 89 103 94 74 119 85 105
Test B 122 100 110 89 102 92 73 121 87 104
The test statistic is _
The critical value is_
Construct a 99% confidence interval for the mean...
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