Question

UVA wants to estimate the average number of hours students spend studying on campus each week. They sample 54 students. This sample showed an average of 15.4 hours per week with a standard deviation for the sample of 9.2 hours. They want a 90% confidence interval

a) what is the 90% confidence interval? (give the interval, 3 decimal places)

b) what is the margin of error? (give the interval, 3 decimal places)

c) write a sentence summarizing the meaning of the confidence interval in terms of the true mean number of hours UVA students spend studying per week.

Answer #1

C)the meaning of the confidence interval- the true mean number of hours UVA students spend studying per week has a 90% chance of being between 13.34 and 17.459

************************************************************************************************************************************

Hi!

If you like the solution, please hit the thumbs up/Like button
as your feedback!

Cheers!

************************************************************************************************************************************

We are interested in the average amount of time De Anza students
spend studying statistics each week. A survey of 32 De Anza
students yields a sample average time of 14.4 hours spent studying
statistics per week with a sample standard deviation of 1.9 hours.
Conduct a hypothesis test using a 5% level of significance, to
determine if the average time spent studying statistics each week
by De Anza students is less than 15 hours.
1. Ho: _______________ Ha: ___________________...

You want to estimate the average time college students spend
studying per week. You know that the population standard deviation
for studying time per week for college students is 3.5 hours. You
want a 99% confidence interval with a margin of error of 30 minutes
(0.50 hours). How many students do you need in your study?
Group of answer choices
188.24 students
325 students
324.9 students
189 students

A professor wants to estimate how many hours per week students
study. A simple random sample of 78 students had a mean of 15.0
hours of studying per week. Construct and interpret a 90%
confidence interval for the mean number of hours a student studies
per week. Assume the population standard deviation is known to be
2.3 hours per week

A professor at a university wants to estimate the average number
of hours of sleep students get during exam week. On the first day
of exams, she asked 21 students how many hours they had slept the
night before. The average of the sample was 4.72 with a standard
deviation of 1.58. When estimating the average amount of sleep with
a 90% confidence interval, what is the margin of error? Question 3
options: 1) 0.5947 2) 0.5933 3) 0.3448 4)...

For a 4-units class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 23
students, and the distribution of total study hours per week is
bell-shaped with a mean of 12 hours and a standard deviation of 3
hours. Use the Empirical Rule to answer the following questions. a)
68% of the students spend between hours and hours on Statistics
each week. b) 95% of the students spend between hours and...

From past studies, the average time college freshmen spend
studying in 22 hours per week. The standard deviation is 4 hours.
This year, 60 students were surveyed, and the average time that
they spent studying was 20.8 hours. Test the claim that the time
students spend studying has not changed. Use a=1%

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 24
students, and the distribution of total study hours per week is
bell-shaped with a mean of 13 hours and a standard deviation of 2.8
hours. Use the Empirical Rule to answer the following questions. a)
68% of the students spend between hours and hours on Statistics
each week. b) 95% of the students spend between hours and...

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 23
students, and the distribution of total study hours per week is
bell-shaped with a mean of 14 hours and a standard deviation of 3.4
hours.
Use the Empirical Rule to answer the following questions.
a) 68% of the students spend between hours and hours on Statistics
each week.
b) 95% of the students spend between hours and...

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 20
students, and the distribution of total study hours per week is
bell-shaped with a mean of 13 hours and a standard deviation of 3.4
hours.
Use the Empirical Rule to answer the following questions.
a) 68% of the students spend between ____ hours and ____ hours on
Statistics each week.
b) 95% of the students spend between...

The University College is interested in the average number of
hours per week that freshmen spend going to parties. They took a
random sample of 300 freshmen and calculated a mean of 6 hours a
week going to parties and a 95% confidence interval for the
population mean to be 4 to 8 hours a week. Based on this
information, what was their standard error of the mean?
Group of answer choices
4
2
1
.67

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 2 minutes ago

asked 25 minutes ago

asked 27 minutes ago

asked 27 minutes ago

asked 51 minutes ago

asked 51 minutes ago

asked 51 minutes ago

asked 54 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago