Question

**4. Study Time.** A university states the mean
number of study hours per week for full-time student (12 units +)
should be at least 20 hours. Based on the random sample of weekly
study hours for the 8 full-time students listed below, is the mean
study time for all full-time students less than the recommended
amount? ( use a=.10, assume sample comes from a population that is
normal)

**21.8 17.6 21.6
16.9 15.4 19.4 22.6
18.1**

Check Assumptions: |
|||||

H |
Diagram: |
||||

H |
|||||

Statistical Variables: |
|||||

Test Statistic: |
P-Value: |
||||

Conclusion and Interpretation: |

Answer #1

A large university claims the mean number of classroom hours per
week for full-time faculty is less than 9 hours per week. A random
sample 11 faculty is selected from this university and found that
the sample mean ¯x is 10 hours per week with a sample standard
deviation of s = 2.15. Perform a hypothesis test for the claim at α
= 0.05 level of significance?
(a) Hypothesis: H0 :
Ha :
(b) Test Statistics=
(c) Pvalue=
(d) The...

The mean number of hours of study time per week for a sample of
554 students is 22. If the margin of error for the population mean
with a 95% confidence interval is 2.1, construct a 95% confidence
interval for the mean number of hours of study time per week for
all students.

6. A university student claims that on average, full-time
students study more than 30 hours per week. A statistics class
conducts a study to test the claim. The students randomly sample 15
students and find ?=32.4 hours and ?=4.2 hours.
a) State the null and alternative hypotheses.
b) Determine the outcome of the student’s test at the:
i) At the 5% significance level. (∝=0.05) ii) At the 1%
significance level. ∝=0.01

The mean number of hours of study time per week for a sample of
524 high-school students is 27. If the margin of error for the
population mean with a 98% confidence interval is 1.7, construct a
98% confidence interval for the mean number of hours of study time
per week for all high-school students.
Lower endpoint?
upper endpoint?

Dean Halverson recently read that full-time college students
study 20 hours each week. She decides to do a study at her
university to see if there is evidence to show that this is not
true at her university. A random sample of 33 students was asked to
keep a diary of their activities over a period of several weeks. It
was found that the average number of hours that the 33 students
studied each week was 22.2 hours. The sample...

Today, full time college students report spending a mean of 27
hours per week on academic activities, both inside and outside of
the classroom. Assume the standard deviation of time spent on
academic activities is 4 hours. If you select a random sample of 50
full-time college students:
A. Describe the shape of the sampling distribution. How do you
know it is this shape?
B. Find the mean and standard deviation for the distribution of
the sample mean (x bar)...

Dean Halverson recently read that full-time college students
study 20 hours each week. She decides to do a study at her
university to see if there is evidence that students study an
average of less than 20 hours each week. A random sample of 34
students were asked to keep a diary of their activities over a
period of several weeks. It was found that he average number of
hours that the 34 students studied each week was 17.9 hours....

Dean Halverson
recently read that full-time college students study 20 hours each
week. She decides to do a study at her university to see if there
is evidence to show that this is not true at her university. A
random sample of 31 students were asked to keep a diary of their
activities over a period of several weeks. It was found that the
average number of hours that the 31 students studied each week was
18.9 hours. The sample...

Dean Halverson recently read that full-time college students
study 20 hours each week. She decides to do a study at her
university to see if there is evidence that students study an
average of more than 20 hours each week. A random sample of 34
students were asked to keep a diary of their activities over a
period of several weeks. It was found that the average number of
hours that the 34 students studied each week was 21.5 hours....

Dean Halverson recently read that full-time college students
study 20 hours each week. She decides to do a study at her
university to see if there is evidence that students study an
average of less than 20 hours each week. A random sample of 32
students were asked to keep a diary of their activities over a
period of several weeks. It was found that he average number of
hours that the 32 students studied each week was 19.1 hours....

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 22 minutes ago

asked 24 minutes ago

asked 29 minutes ago

asked 45 minutes ago

asked 49 minutes ago

asked 49 minutes ago

asked 54 minutes ago

asked 59 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago