Question
In: Statistics and Probability
The number of visitors to the historic Museum for 25 randomly selected hours is shown. 15 ...
The number of visitors to the historic Museum for 25 randomly selected hours is shown.
15 53 48 19 38 86 63 98 79 38 26 39 67 89 62 28 35 54 88 76
31 47 53 41 68.
Exercise 1
- What is the sample size?
- Is the variable qualitative or quantitative?
- Is the variable discrete or continuous?
- What is the level of measurement?
Exercise 2
In order to organize the following data in to 5 classes:
- What is the range of the data set?
- Find the width of the classes
- What will be the first class limit?
- What is the first class boundary?
- What is the first class midpoint?
- What is the frequency for the first class?
Solutions
orchestra answered 1 year agoRelated Solutions
The number of visitors to the historic Museum for 25 randomly selected hours is shown.
The number of visitors to the historic Museum for 25 randomly
selected hours is shown.15 53 48 19
38 86 63 98
79 38 26 39
67 89 62 28
35 54 88 7631 47 53 41 68.Exercise 3You may use your calculator or excel to compute:The sample mean, sample variance and sample standard
deviationWhat is the Coefficient of variation?What are the range of values that are within two standard
deviation of the mean?How many data values are within this...
The number of visitors to the Historic Museum for 14 randomly selected hours is shown. 9...
The number of visitors to the Historic Museum for 14
randomly selected hours is shown.
9
30
30
31
35
36
37
37
39
53
55
63
64
95
Identify the five-number summary and the interquartile
range (IQR)?
Min :
Q1 :
MD:
Q3 :
Max :
IQR:
B.Construct a boxplot for the data?
C.comment on the shape of the distribution.
D.Determine if there are any outliers?
The number of hours of reserve capacity of 10 randomly selected automotive batteries is shown to...
The number of hours of reserve capacity of 10 randomly
selected automotive batteries is shown to the right.1.73
1.85
1.56
1.64
1.71
1.98
1.32
1.51
1.46
2.01
Assume the sample is taken from a normally distributed population.
Construct 80% confidence intervals for (a) the population
variance sigmasquared and (b) the population standard deviation
sigma.
The number of hours of reserve capacity of 1010 randomly selected automotive batteries is shown to...
The number of hours of reserve capacity of
1010
randomly selected automotive batteries is shown to the right.
1.791.79
1.861.86
1.581.58
1.691.69
1.731.73
1.951.95
1.371.37
1.551.55
1.421.42
2.052.05
Assume the sample is taken from a normally distributed
population. Construct
9595%
confidence intervals for (a) the population variance
sigmaσsquared2
and (b) the population standard deviation
sigmaσ.
(a) The confidence interval for the population variance is
(nothing,nothing).
(Round to three decimal places as needed.)
Drug concentrations (measured as a percentage) for 25 randomly selected tablets are shown in the accompanying...
Drug concentrations (measured as a percentage) for 25 randomly
selected tablets are shown in the accompanying table. For
comparisons against a standard method, the scientists desire an
estimate of the variability in drug concentrations. Obtain the
estimate for the population variance for the scientists using a
95% confidence interval. Interpret the interval.
91.06
92.09
89.98
91.67
82.88
94.09
89.73
89.34
84.27
87.34
89.14
91.67
84.31
89.95
92.28
92.14
84.72
90.02
92.23
89.95
89.17
89.24
92.87
88.57
89.55
A survey of 25 randomly selected customers found the ages shown (in years). The mean is...
A survey of 25 randomly selected customers found the ages shown
(in years).
The mean is 32.64 years and the standard deviation is 9.97
years.
a) What is the standard error of the mean?
b) How would the standard error change if the sample size had
been
400
instead of
25?
(Assume that the sample standard deviation didn't change.)
A survey of 25 randomly selected customers found the ages shown (in years). The mean is...
A survey of 25 randomly selected customers found the ages shown
(in years). The mean is 32.24 years and the standard deviation is
9.55 years.
30
41
48
36
20
36
37
36
26
27
17
23
39
35
21
10
31
42
32
41
43
28
47
25
35
a) Construct a 90% confidence interval for the mean age of all
customers, assuming that the assumptions and conditions for the
confidence interval have been met.
b) How large is...
A survey of 25 randomly selected customers found the ages shown (in years). The mean is...
A survey of 25 randomly selected customers found the ages shown
(in years). The mean is 31.52
years and the standard deviation is 10.24 years.
a) Construct a 95% confidence interval for the mean age of
all customers, assuming that the assumptions and conditions for
the confidence interval have been met.
b) How large is the margin of error?
c) How would the confidence interval change if you had assumed
that the standard deviation was known to be 11.0
years?...
A survey of 25 randomly selected customers found the ages shown (in years). The mean is...
A survey of 25 randomly selected customers found the ages shown
(in years). The mean is 33.16 years and the standard deviation is
9.33
years.
a) Construct a 95% confidence interval for the mean age of all
customers, assuming that the assumptions and conditions for the
confidence interval have been met.
b) How large is the margin of error?
c) How would the confidence interval change if you had assumed
that the standard deviation was known to be 10.0 years?...
A survey of 25 randomly selected customers found the ages shown (in years). The mean is...
A survey of 25 randomly selected customers found the ages shown
(in years). The mean is 32.04 years and the standard deviation is
9.87 years.
a) Construct a 80% confidence interval for the mean age of all
customers, assuming that the assumptions and conditions for the
confidence interval have been met.
b) How large is the margin of error?
c) How would the confidence interval change if you had assumed
that the standard deviation was known to be 10.0 years?
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