Question

A random sample from 19 shirt manufacturers in Thailand was sampled for number of hours each week they operated. The average number of hours was 96.5 with a standard deviation of 13.2 hours. At the 5% significance level (use table below), the null hypothesis that the mean hours operated exceeds 95 will

Answer #1

A random sample of 800 teenagers revealed that in this sample,
the mean number of hours per week of TV watching is 13.2 with a
sample standard deviation of 1.6. Find and interpret a 95%
confidence interval for the true mean weekly hours of TV watching
for teenagers.

Question #6
Beth’s Ltd manufactures screws which are used to manufacture
tables. The table manufacturers, M & M Ltd, require that the
screws have a length of 150 mm, with a small tolerance for
differences in length. Beth’s Ltd randomly sampled and measured the
average length of screws for 25 production runs. Due to the fact
that the table manufacturers require a small tolerance for
differences in the length of the screws, a 5% (0.05) significance
level for evaluation was...

A sociologist studied gender differences in the average number
of hours worked per day among employees at a law firm (there are 42
men and 19 women employed at this firm). She obtained the following
results: men work, on average, 52 hour per week and women work, on
average, 56 hour per week. The standard deviation for men is 12
hours and the standard deviation for women is 9 hours. Test the
null hypothesis of no difference in the average...

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...

Social Services wanted to determine the average number of hours
a week that working parents need for daycare services. A random
sample of 50 working parents gave a sample mean of 38 hours with a
standard deviation of 6 hours. Make a 95% confidence interval for
the average number of hours of daycare services a week that working
parents need.

A random sample of 36 students shows that the mean number of
hours spent each night on homework is 2.5 hours, with a standard
deviation of 0.75 hours. (Study time is assumed to be normally
distributed.) He has expressed concern that this mean is lower than
in the past when 3.0 hours was the norm. Use a one sample test of
the means (at 95% confidence) to determine if his concern is
justified. Is it?

Is the average capacity of batteries less than 120 ampere-hours?
A random sample of 49 batteries had a mean of 118.47 and a standard
deviation of 3.66. Assume a normal distribution. Test at the 0.1
level of significance. (USING Z TABLE)

In order to determine how many hours per week freshmen college
students watch television, a random sample of 25 students was
selected. It was determined that the students in the sample spent
an average of 19.5 hours with a sample standard deviation of 3.9
hours watching TV per week. Please answer the following questions:
(a) Provide a 95% confidence interval estimate for the average
number of hours that all college freshmen spend watching TV per
week. (b) Assume that a...

A researcher claims that high-school students exercise an
average (mean) of 8 hours per week. (You think that the number is
actually higher.) From a sample of 40 students, you find a mean of
9 hours with a sample standard deviation of 1 hour. Conduct a
hypothesis test using a 5% significance level.
a) What are the null and alternative hypotheses?
b) What is the test statistic?
c) What is the p-value?
d) Do your reject the null hypothesis? Explain...

The dean of a university estimates that the mean number of
classroom hours per week for full-time faculty is
11.0.
As a member of the student council, you want to test this
claim. A random sample of the number of classroom hours for eight
full-time faculty for one week is shown in the table below. At
α=0.05,
can you reject the dean's claim? Complete parts (a) through
(d) below. Assume the population is normally distributed.
12.3
7.2
11.8
7.5
6.8...

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