Question

Suppose we are interested in determining the average amount of money students spend on textbooks every year. If we obtained 420 simple random samples and constructed a 90% confidence interval for each sample, we would expect ______ of the confidence intervals to contain the true population mean.

Answer #1

Given that, sample size (n) = 420 and we constructed 90% confidence interval for the population mean for each sample.

Then 420 * 0.90 = 378 of the confidence intervals contain the true population mean.

OR 90% of the confidence intervals contain the true population mean.

Therefore, Suppose we are interested in determining the average
amount of money students spend on textbooks every year. If we
obtained 420 simple random samples and constructed a 90% confidence
interval for each sample, we would expect **378 (or
90%)** of the confidence intervals to contain the true
population mean.

You are interested in determining the amount of time (in
minutes) you spend each day on the Internet. For seven days, these
values are: 51, 24, 16, 88, 63, 28, and 59. Assume that the amount
of time you spend on the Internet each day is normally distributed,
and develop a 90% confidence interval for the population average
amount of time.

You own a small storefront retail business and are interested in
determining the average amount of money a typical customer spends
per visit to your store. You take a random sample over the course
of a month for 24 customers and find that the average dollar amount
spent per transaction per customer is $80.117 with a standard
deviation of $13.8918. When creating a 95% confidence interval for
the true average dollar amount spend per customer, what is the
margin of...

You are interested in determining the amount of time you spend
each day on the Internet. For a random seven days, you record the
time (in minutes) that you spend on the Internet. These times are
listed below.
51 24 16
88 63
28 59
Assuming that the amount of time you spend on the Internet each
day is normally distributed, a 90% confidence interval for the mean
time you spend each day on the Internet is:

You are interested in finding a 90% confidence interval for the
average commute that non-residential students have to their
college. The data below show the number of commute miles for 10
randomly selected non-residential college students. Round answers
to 3 decimal places where possible.
10 13 24 14 11 10 22 9 21 22
b. With 90% confidence the population mean commute for
non-residential college students is between and miles.
c. If many groups of 10 randomly selected non-residential
college...

You are interested in finding a 90% confidence interval for the
average commute that non-residential students have to their
college. The data below show the number of commute miles for 11
randomly selected non-residential college students. Round answers
to 3 decimal places where possible.
23
8
9
7
7
16
7
14
6
24
17
a. To compute the confidence interval use a
distribution.
b. With 90% confidence the population mean commute for
non-residential college students is between and miles....

We are interested in determining whether a sample of students at
FAU differ significantly from the national college population in
terms of the average amount of time spent in college. To evaluate
this, we need to conduct a(n)
independent samples t-test
dependent samples t-test
one-sample t-test
any of these would be appropriate

You are interested in finding a 90% confidence interval for the
average commute that non-residential students have to their
college. The data below show the number of commute miles for 14
randomly selected non-residential college students. Round answers
to 3 decimal places where possible.
10
21
26
20
18
12
11
16
17
6
14
25
25
6
a. To compute the confidence interval use a ? z
t distribution.
b. With 90% confidence the population mean commute for
non-residential college...

You are interested in finding a 90% confidence interval for the
average commute that non-residential students have to their
college. The data below show the number of commute miles for 14
randomly selected non-residential college students. Round answers
to 3 decimal places where possible.
10
21
26
20
18
12
11
16
17
6
14
25
25
6
a. To compute the confidence interval use a ? z
t distribution.
b. With 90% confidence the population mean commute for
non-residential college...

You own a small storefront retail business and are interested in
determining the average amount of money a typical customer spends
per visit to your store. You take a random sample over the course
of a month for 45 customers and find that the average dollar amount
spent per transaction per customer is $90.422 with a standard
deviation of $13.895. When creating a 90% confidence interval for
the true average dollar amount spend per customer, what is the
margin of...

You are interested in finding a 95% confidence interval for the
average commute that non-residential students have to their
college. The data below show the number of commute miles for 11
randomly selected non-residential college students.
28
13
27
7
19
16
22
13
6
7
16
If many groups of 11
randomly selected non-residential college students are surveyed,
then a different confidence interval would be produced from each
group. About ____ percent of these confidence intervals will
contain the...

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