Question

Suppose the university wants to determine what proportion of students prefer online tests to in-class tests. The university invites the students to participate in a survey and out of 130 students that responded 39 prefer online testing. |

(a) | Find the 90% confidence interval for the true proportion of students that prefer online testing. |

(b) | What is the minimum number of students that should answer the survey in order to know with at least 98% certainty that the true proportion of students that prefer online testing lies within 2% of the estimate given by the survey results? |

Answer #1

A local restaurant wants to determine what proportion of their
customers prefer red wine with dinner instead of white wine. If
they use a 99% level of confidence, how many customers do they need
to survey to be within 2.5% of the true proportion?

A survey of 180 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 90 of the 180 students
responded "yes". An approximate 98% confidence interval is (0.413,
0.587). Complete parts a through C. a) How would the confidence
interval change if the confidence level has been 95% instead of 98%
b) How would confidence interval change if the sample size...

1/ A physical therapist wants to determine the difference in the
proportion of men and women who participate in regular sustained
physical activity. What sample size should be obtained if she
wishes the estimate to be within five percentage points with 95%
confidence, assuming that
(a)she uses the estimates of 21.8% male and
18.3% female from a previous year? n = (Round up to the nearest
whole number.)
(b) she does not use any prior estimates?
2/ A survey asked,...

Suppose a professor wants to estimate the proportion of UM
students who have a satisfying experience with the e-learning
approach adopted by the school in the current semester. What is the
minimum sample size that he should use if he wants the estimate to
be accurate within ±0.06 with a 90% confidence?
Select one:
a. 752
b. 267
c. 188
d. 456

9- The dean of the school wants to know the proportion of
students in the school who prefer online classes for the next
semester. How do you conduct a research to estimate this proportion
by sampling (suppose that you can take only one sample of size n
which is smaller than the population size N, and also suppose that
a %90 percent confidence interval is fine). - You should explain
all steps you take including how you make decision about...

9- The dean of the school wants to know the proportion of
students in the school who prefer online classes for the next
semester. How do you conduct a research to estimate this proportion
by sampling (suppose that you can take only one sample of size n
which is smaller than the population size N, and also suppose that
a %90 percent confidence interval is fine). - You should explain
all steps you take including how you make decision about...

Suppose a professor wants to estimate the proportion of UM
students who have a satisfying experience with the e-learning
approach adopted by the school in the current semester. What is the
minimum sample size that he should use if he wants the estimate to
be accurate within ±0.06 with a 90% confidence?
Select one:
a. 267
b. 752
c. 456
d. 188
If P(A) = 0.4 and P(B) = 0.6, which of the following must be
true?
Select one:
a....

A university also wants to determine if there are significant
differences in GPA among students from different majors. They
collect data on GPA for four different majors and find the
following results: Business Administration (M = 2.9; N = 60), Fine
Art (M = 3.3; N = 60), Nursing (M = 3.5; N = 60), and Psychology (M
= 3.6; N = 60). They also calculated the between-group and total
sum of squares (SSB = 19.8; SST = 303.0). Use...

1. When constructing a confidence interval to estimate a
population proportion, what affects the size of the margin of
error?
A. The sample size
B. The sample proportion
C. The confidence level
D. All of the above affect the size of the margin of error
E. None of the above affect the size of the margin of error
2. What percentage of couples meet through online dating
apps? A survey of a random sample of couples finds that 12% say...

PART A) The owner of a golf course wants to determine if his
golf course is more difficult than the one his friend owns. He has
25 golfers play a round of 18 holes on his golf course and records
their scores. Later that week, he has the same 25 golfers play a
round of golf on his friend's course and records their scores
again. The average difference in the scores (treated as the scores
on his course - the...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 1 minute ago

asked 4 minutes ago

asked 8 minutes ago

asked 13 minutes ago

asked 13 minutes ago

asked 13 minutes ago

asked 13 minutes ago

asked 17 minutes ago

asked 20 minutes ago

asked 21 minutes ago

asked 22 minutes ago