Question
In: Statistics and Probability
A random sample of 15 people was asked to record how much TV they watched every...
A random sample of 15 people was asked to record how much TV they watched every day for a week. The total number of hours each person watched during the week is displayed below.
a. Is a normal approximation appropriate here?
A. Yes
B. No
The data are shown below.
| 0.0 | 7.8 | 8.6 | 9.7 | 11.3 |
| 17.7 | 19.0 | 19.1 | 19.5 | 20.4 |
| 22.9 | 25.8 | 33.8 | 36.8 | 39.2 |
b. If a normal approximation is appropriate, find the probability that a randomly selected person in the population watches less than 9 of TV per week. If a normal approximation is not appropriate, type “NA” (without the quotes).
Solutions
orchestra answered 1 year agoRelated Solutions
A random sample of 15 people was asked to record how much TV they watched every...
A random sample of 15 people was asked to record how much TV
they watched every day for a week. The total number of hours each
person watched during the week is displayed below.
The data are shown below.
0.0
7.8
8.6
9.7
11.3
17.7
19.0
19.1
19.5
20.4
22.9
25.8
33.8
36.8
39.2
b. If a normal approximation is appropriate, find the
probability that a randomly selected person in
the population watches less than 9 of TV per
week....
In a random sample of 200 people, 135 said that they watched educational TV. Find the...
In a random sample of 200 people, 135 said that they watched
educational TV. Find the 95% confidence interval of the true
proportion of people who watched educational TV.
A.
0.325 < < 0.675
B.
–1.96 < < 1.96
C.
0.6101 < < 0.7399
D.
0.6704 < < 0.6796
How much Tv do you watch each week? A random sample of 41 adults were asked...
How much Tv do you watch each week? A random sample of 41 adults
were asked this question and thee mean found to be 3.9 hours with
standard deviation 1.6 hours.
a. Find the 99% confidence interval for the population mean
number of hours of TV watched each week.
b. Is it thought that most adults watch 3 hours of TV each week.
Do the data support this? Why of why not?
c. What is the margin of error in...
Watching TV: The general Social Survey asked a large number of people how much time they...
Watching TV: The general Social Survey asked a large number of
people how much time they spent watching TV each day. The mean
number of hours was 3.09 with a standard deviation of 2.93 . Assume
that in a sample of 34 teenagers, the sample standard deviation of
daily TV time is 4.1 hours, and that the population of TV watching
times is normally distributed. Can you conclude that the population
standard deviation of TV watching times for teenagers differs...
in a random sample of 200 people 153 said that they watched educational television find the...
in a random sample of 200 people 153 said that they watched
educational television find the 99% confidence interval of the true
proportion of people who watched educational television round
intermediate answers to at least 5 decimal places and final answer
to 3
In a survey, 15 people were asked how much they spent on their child's last birthday...
In a survey, 15 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $48 and standard deviation of $7. Construct a
confidence interval at a 90% confidence level.
Give your answers to one decimal place.
In a survey, 15 people were asked how much they spent on their child's last birthday...
In a survey, 15 people were asked how much they spent on their
child's last birthday gift. The results were roughly bell-shaped
with a mean of $46 and standard deviation of $9. Construct a
confidence interval at a 80% confidence level. Give your answers to
one decimal place. ____ ± ______
Educational Television In a random sample of 186 people, 138 said that they watched educational television....
Educational Television In a random sample of
186 people, 138 said that they watched educational television. Find
the 94%confidence interval of the true proportion of people who
watched educational television. Use a graphing calculator. Round
the answers to at least three decimal places.
An instructor asked a random sample of eight students to record their study times at the...
An instructor asked a random sample of eight students to record
their study times at the beginning of a course. She then made a
table for total hours studied (x) over 2 weeks and test score (y)
at the end of the 2 weeks. The table is given below. Complete
parts (a) through (f).
x
9
13
13
18
10
16
15
23
y
92
78
83
78
86
79
83
83
a. Find the regression equation for the data...
1. A random sample of 10 Harper College students was asked the question, “How much did...
1. A random sample of 10 Harper College students was asked the
question, “How much did you spend on textbooks this semester?”
Below are the data of their responses:
Amount Spent ($) 292 240 316 361 449 428 402 286 349 250
Construct and interpret a 95% confidence interval for the mean
amount spent for textbooks by all Harper College students.
What was the margin of error associated with your estimate?
Explain its meaning.
Follett claims the mean amount spent...
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