In: Statistics and Probability

In a recent survey of high school students, it was found that the amount of time spent on reading books per week was normally distributed with a mean of 32 minutes. Assume the distribution of weekly reading time follows the normal distribution with a population standard deviation of 2 minutes. Suppose we select a sample of 20 high school students.

**a**. What is the standard error of the mean time?
Answer

**b.** What percent of the sample means will be
greater than 32.50 minutes? Answer

**c.** What percent of the sample means will be
greater than 31.50 minutes? Answer

**d.** What percent of the sample
means will be greater than 31.50 but less than 32.50 minutes?
Answer

A recent national survey found that high school students watched
an average (mean) of 7.2 DVDs per month with a population standard
deviation of 0.90 hour. The distribution of DVDs watched per month
follows the normal distribution. A random sample of 35 college
students revealed that the mean number of DVDs watched last month
was 6.20. At the 0.05 significance level, can we conclude that
college students watch fewer DVDs a month than high school
students?
e.
What is the...

A recent national survey found that high school students watched
an average (mean) of 6.5 movies per month with a population
standard deviation of 0.6. The distribution of number of movies
watched per month follows the normal distribution. A random sample
of 33 college students revealed that the mean number of movies
watched last month was 5.8. At the 0.05 significance level, can we
conclude that college students watch fewer movies a month than high
school students?
State the null...

Question 1
A recent national survey found that high school students watched
an average of 6.8 videos per month. A random sample of 36 high
school students revealed that the mean number of vidoes watched
last month was 6.2. From past experience it is known that the
population standard deviation of the number of vidoes watched by
high school students is 0.5. At the 0.05 level of signifiance, can
we conclude that high school students are watching fewer
vidoes?
(a)...

A recent national survey found that high school students watched
an average (mean) of 6.6 DVDs per month with a population standard
deviation of 0.90 hour. The distribution of DVDs watched per month
follows the normal distribution. A random sample of 43 college
students revealed that the mean number of DVDs watched last month
was 6.10. At the 0.05 significance level, can we conclude that
college students watch fewer DVDs a month than high school
students?
d.
What is your...

A recent national survey found that high school students watched
an average (mean) of 6.6 DVDs per month with a population standard
deviation of 0.90 hour. The distribution of DVDs watched per month
follows the normal distribution. A random sample of 43 college
students revealed that the mean number of DVDs watched last month
was 6.10. At the 0.05 significance level, can we conclude that
college students watch fewer DVDs a month than high school
students?
b.
State the decision...

A recent national survey found that high school students watched
an average (mean) of 7.2 movies per month with a population
standard deviation of 0.7. The distribution of number of movies
watched per month follows the normal distribution. A random sample
of 47 college students revealed that the mean number of movies
watched last month was 6.2. At the 0.05 significance level, can we
conclude that college students watch fewer movies a month than high
school students?
State the null...

A recent national survey found that high school students watched
an average of 6.8 DVDs per month with a population standard
deviation of 0.5 DVDs. The distribution follows the normal
distribution. A random sample of 36 college students revealed that
the mean number of DVDs watch last month was 6.2. At the .05
significance level, can we conclude that college students watch
fewer DVDs a month than high school students?
a. What is the null and alternative hypotheses?
b. Is...

I need the CORRECT answer!!!
A recent national survey found that high school students watched
an average (mean) of 7.4 movies per month with a population
standard deviation of 0.9. The distribution of number of movies
watched per month follows the normal distribution. A random sample
of 34 college students revealed that the mean number of movies
watched last month was 6.9. At the 0.05 significance level, can we
conclude that college students watch fewer movies a month than high...

In a recent survey of county high school students, 100 males and
100 females, 66 of the male students and 47 of the female students
sampled admitted that they consumed alcohol on a regular basis.
Find a 90% confidence interval for the difference between the
proportion of male and female students that consume alcohol on a
regular basis. Can you draw any conclusions from the confidence
interval?
For the test of significance questions, clearly indicate each of
the formal steps...

A recent survey of 31 students reported that the average amount
of time they spent listening to music was 11.5 hours per week, with
a sample standard deviation of 9.2 hours. Which of the following is
a 90% confidence interval for the mean time per week spent
listening to the radio?
Is this confidence interval for a population mean or population
proportion? When do you use a z-test and when do you use a
t-test?

ADVERTISEMENT

ADVERTISEMENT

Latest Questions

- Given a system with 4M bytes of address space per process, 64M bytes of physical memory,...
- Explain in your own words the requirements an indeterminate structure should satisfy and name the methods...
- Let P2 be the vector space of all polynomials of degree less than or equal to...
- Develop a python program to create a quiz with limited time and attempts!!! Add comments and...
- Quantitative noninvasive techniques are needed for routinely assessing symptoms of peripheral neuropathies, such as carpal tunnel...
- The Blending Department of Luongo Company has the following cost and production data for the month...
- A suspension of calcium carbonate particles in water flows through a pipe. An engineer was asked...

ADVERTISEMENT