Question

You are interested in finding a 95% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 12 randomly selected college students.

3 | 12 | 8 | 1 | 10 | 10 | 6 | 1 | 7 | 7 | 4 | 9 |

a. To compute the confidence interval use a distribution.

b. With 95% confidence the population mean number of days of class that college students miss is between answer _____ and answer ________ days.

c. If many groups of 12 randomly selected non-residential college students are surveyed, then a different confidence interval would be produced from each group. About answer ______ percent of these confidence intervals will contain the true population mean number of missed class days and about answer ______ percent will not contain the true population mean number of missed class days.

Answer #1

a. To compute the confidence interval use a **t**
distribution.

b. With 95% confidence the population mean number of days of
class that college students miss is between **4.2091**
and **8.7909** days.

c. If many groups of 12 randomly selected non-residential
college students are surveyed, then a different confidence interval
would be produced from each group. About **95**
percent of these confidence intervals will contain the true
population mean number of missed class days and about
**5** percent will not contain the true population
mean number of missed class days.

You are interested in finding a 90% confidence interval for the
average number of days of class that college students miss each
year. The data below show the number of missed days for 10 randomly
selected college students.
11 0 10 11 3 11 8 9 4 3
a. To compute the confidence interval use a distribution.
b. With 90% confidence the population mean number of days of
class that college students miss is answer ____ between and answer
____...

You are interested in finding a 98% confidence interval for the
average number of days of class that college students miss each
year. The data below show the number of missed days for 10 randomly
selected college students. Round answers to 3 decimal places where
possible.
2
0
10
7
11
1
3
11
2
0
a. To compute the confidence interval use a ? t
z distribution.
b. With 98% confidence the population mean number of days of
class that...

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...

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 12
randomly selected non-residential college students. Round answers
to 3 decimal places where possible.
5
15
25
16
17
26
6
6
11
5
8
19
a. To compute the confidence interval use a ? t
z distribution.
b. With 95% confidence the population mean commute for
non-residential college students is...

You are interested in finding a 98% confidence interval for the
average commute that non-residential students have to their
college. The data below show the number of commute miles for 13
randomly selected non-residential college students.
28
12
25
14
15
12
5
18
28
7
6
18
24
a. To compute the confidence interval use a ? t
z distribution.
b. With 98% confidence the population mean commute for
non-residential college students is between and
miles.
c. If many groups of...

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....

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 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 are interested in finding a 95% confidence interval for the
mean number of visits for physical therapy patients. The data below
show the number of visits for 10 randomly selected physical therapy
patients.
17 24 24 19 7 25 9 9 11 15
a. To compute the confidence interval use a distribution.
b. With 95% confidence the population mean number of visits per
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visits.
c. If many groups of...

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