Question
In: Statistics and Probability
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 errors from the sampling proportion.
(1 pt)
- How would the confidence interval have changed if the
confidence level was 90% instead of 95%? (1
pt)
- How would the confidence interval have changed if the sample
size had been 100 instead of 200? (1
pt)
- What is the value of the sample proportion? (0.5
pts)
Solutions
orchestra answered 2 years agoRelated Solutions
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...
2. A survey of 200 students is selected randomly on a large university campus. They are...
2. 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 128 of the
200 students responded ”yes."
A. Find 98% confidence interval
B. How would the confidence interval change if the
confidence level had been 90% instead of 98%?
C. How would the confidence interval change if the
sample size had been 300 instead of 200?...
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 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...
At a large university it is known that 45% of the students live on campus. The...
At a large university it is known that 45% of the students live
on campus. The director of student life is going to take a random
sample of 100 students. What is the probability that more than half
of the sampled students live on campus?
A survey of 196 randomly selected college students at a local university found that only 78%...
A survey of 196 randomly selected college students at a local
university found that only 78% of them checked their college email
on a regular basis. The standard deviation is 7.4. Construct the
confidence interval for the population proportion with a 90%
confidence level.
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:
On a course pre-test at a large university, 102 out of 600 randomly selected students taking...
On a course pre-test at a large university, 102 out of 600
randomly selected students taking Accounting II answered every
question correctly. At the end of the course, 144 out of 450
randomly selected students answered every question correctly. (The
pre and post-tests were identical.)
What is considered “success” for the binomial variable being
tested?
Fill in the blanks to complete the hypotheses for a test to
determine if the course instruction was effective in improving
students’ knowledge about accounting?...
On a course pre-test at a large university, 102 out of 600 randomly selected students taking...
On a course pre-test at a large university, 102 out of 600
randomly selected students taking Accounting II answered every
question correctly. At the end of the course, 144 out of 450
randomly selected students answered every question correctly. (The
pre and post-tests were identical.)
What is considered “success” for the binomial variable being
tested?
Fill in the blanks to complete the hypotheses for a test to
determine if the course instruction was effective in improving
students’ knowledge about accounting?...
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
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