Question
In: Statistics and Probability
A sample of 20 Ohio University students were randomly selected and asked, “How many phone calls...
A sample of 20 Ohio University students were randomly selected and asked, “How many phone calls did you receive last night?” The numbers below are their responses.
1 2 0 2 4 2 3 4 0 5 3 4 5 6 3 10 7 6 7 11
Compute the standard deviation of the distribution.
Answers:
a. 6.4
b. 2.51
c. 3.16
d. 2.97
Solutions
Expert Solution
Sample standard deviation=2.97
Option(D) is correct
Solution file is attached go through it
Option D is correct
I think I was helpful
Thanks
orchestra answered 2 years agoRelated Solutions
A sample of 20 Ohio University students were randomly selected and asked, “How many phone calls...
A sample of 20 Ohio University students were randomly selected
and asked, “How many phone calls did you receive last night?” The
numbers below are their responses.
1 2 0 2 4 2 3 4 5 3
0 4 5 6 3 10 7 6 7 11
Compute the IQR of the distribution.
Answers:
a. 6
b. 3
c. 4
d. 2
60 randomly selected students were asked how many siblings were in their family. Let X =...
60 randomly selected students were asked how many siblings were
in their family. Let X = the number of pairs of siblings in the
student's family. The results are as follows:
Siblings
Frequency
1
13
2
22
3
15
4
6
5
3
6
0
7
1
Round your answers to two decimal places.
The mean is:
The median is:
The sample standard deviation is:
The first quartile is:
The third quartile is:
What percent of the respondents have had...
54 randomly selected students were asked how many siblings were in their family. Let X -...
54 randomly selected students were asked how many siblings were
in their family. Let X - the number of pairs of siblings in the
student's family.
# of Siblings
0
1
2
3
4
5
Frequency
5
9
10
13
10
7
Round all your answers to one decimal place.
The mean is:
The median is:
The sample standard deviation is:
The first quartile is:
The third quartile is:
What percent of the respondents have at least 1 siblings?
_____%...
52 randomly selected students were asked how many siblings were in their family. Let X represent...
52 randomly selected students were asked how many siblings were
in their family. Let X represent the number of pairs of siblings in
the student's family. The results are as follows:
# of Siblings
0
1
2
3
4
5
6
Frequency
10
11
7
4
5
10
5
Round all your answers to 4 decimal places where
possible.
The mean is:
The median is:
The sample standard deviation is:
The first quartile is:
The third quartile is:
What percent...
A sample of 1000 college students at NC State University were randomly selected for a survey....
A sample of 1000 college students at NC State University were
randomly selected for a survey. Among the survey participants, 108
students suggested that classes begin at 8 AM instead of 8:30 AM.
The sample proportion is 0.108.
What is the lower endpoint for the 90% confidence interval? Give
your answer to three decimal places.
(Note that due to the randomization of the questions, the
numbers in this question might be different from the previous
question.)
Answer:
A survey of 200 students is selected randomly on a large university campus They are asked...
A survey of 200 students is selected randomly on a large
university campus They are asked if they use a laptop in class to
take notes. The result of the survey is that 70 of the 200 students
use laptops to take notes in class.
What is the value of the sample proportion? (0.5
pts)
What is the standard error of the sampling proportion?
(0.5 pts)
Construct an approximate 95% confidence interval for the true
proportion by going 2 standard...
A survey of 150 students is selected randomly on a large university campus. They are asked...
A survey of 150 students is selected randomly on a large
university campus. They are asked if they use a laptop in class to
take notes. The result of the survey is that 60 of the 150 students
responded "yes." An approximate 98% confidence interval is
(0.307, 0.493). Complete parts a through d below. b) How would
the confidence interval change if the sample size had been 375
instead of 150? (Assume the same sample proportion.) The new
confidence interval...
A survey of 200 students is selected randomly on a large university campus. They are asked...
A survey of 200 students is selected randomly on a large
university campus. They are asked if they use a laptop in class to
take notes. Suppose that based on the survey, 80 of the 200
students responded "yes."
a) What is the value of the sample proportion ModifyingAbove p
with caret?
b) What is the standard error of the sample proportion?
c) Construct an approximate 95% confidence interval for the
true proportion p by taking plus or minus 2...
A survey of 250 students is selected randomly on a large university campus. They are asked...
A survey of 250 students is selected randomly on a large
university campus. They are asked if they use a laptop in class to
take notes. The result of the survey is that 115 of the 250
students responded "yes." An approximate 95% confidence interval
is (0.397,0.523). Which of the following are true? If they are
not true, briefly explain why not
a)95% of the students fall in the interval
(0.397,0.523).
b) The true proportion of students who use laptops...
A sample of 130 working students at a large university was asked how many hours they...
A sample of 130 working students at a large university was asked
how many hours they work in a typical week. A 95% z confidence
interval for the average number of hours a week a typical student
employee works was (13.5, 15.3)
(a)Identify each of the following interpretations as TRUE or
FALSE with a brief explanation for each.
i. 95% of sampled student workers work between 13.5 and 15.3
hours in a typical week.
ii. We are 95% confident that...
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