Question
In: Statistics and Probability
From past studies the average time college freshmen spend studying is 22 hours per week. The...
From past studies the average time college freshmen spend studying is 22 hours per week. The standard deviation is 4 hours. This year, 60 students were surveyed, and the average time that they spent studying was 20.8 hours. Test the claim that the time students spend studying has not changed. Use a=1%
Solutions
orchestra answered 1 year agoRelated Solutions
from past studies the average time college freshmen spend studying n 22 hours per week. The...
from past studies the average time college freshmen spend
studying n 22 hours per week. The standard deviation is 4 hours.
This year, 60 students were surveyed, and the average time that
they spent studying was 20.8 hours. Test the claim that the time
students spend studying has not changed. Use a=1%
The times that college students spend studying per week have a distribution that is skewed to...
The times that college students spend studying per week have a
distribution that is skewed to the right with a mean of 7.0 hours
and a standard deviation of 2.4 hours. Find the probability that
the mean time spent studying per week for a random sample of 45
students would be
a. between 7.4 and 8.2 hours.
b. less than 7.4 hours
. Note 1: Round your z values to 2 decimal places before looking
them up in the table...
. In order to determine how many hours per week freshmen college students watch television, a...
. 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 4.2
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...
The times that college students spend studying per week have a distribution skewed to the right...
The times that college students spend studying per week have a
distribution skewed to the right with a mean of 8.3 hours and a
standard deviation 2.6 of hours. Find the probability that the mean
time spent studying per week for a random sample of 55 college
students would be a. between 7.6 and 8.4 hours. Round your answer
to two decimal places. b. less than 8.1 hours. Round your answer to
two decimal places.
THE ANSWERS ARE NOT .49...
The times that college students spend studying per week have a distribution skewed to the right...
The times that college students spend studying per week have a
distribution skewed to the right with a mean of 7.6 hours and a
standard deviation of 2.6 hours. Find the probability that the mean
time spent studying per week for a random sample of 45 college
students would be
a. between 7.0 and 7.9 hours.
Round your answer to two decimal places.
P=____
b. less than 7.3 hours.
Round your answer to two decimal places.
P=____
Assume that the amount of time (hours) that young apprentices spend per week on their homework...
Assume that the amount of time (hours) that young apprentices
spend per week on their homework in their training program at a
major manufacturer is normally distributed with a mean of 12 hours
and a standard deviation of 5.
3. If 65 apprentices are selected at random, find the
probability that they average more than 12 hours per week on
homework.
a. 0.3999 b. 0.6999 c. 0.5000 d. 0.7999
4. If 65 apprentices are selected at random, find the
probability...
A student taking economics, statistics, and finance has decided to spend 9 hours per week studying....
A student taking economics, statistics, and finance has decided
to spend 9 hours per week studying. The objective is to maximize
the average grade, which means maximizing the total grade in the
three courses. The table shows the student's estimate of the
relation between time spent studying each course and the grade for
each course.
Hours of Study
Grade In
Economics
Statistics
Finance
0
50
42
56
1
62
54
68
2
71
64
76
3
79
72
82
4...
Students studying at GWU spend an average of $172.50 per week on basic needs other than...
Students studying at GWU spend an
average of $172.50 per week on basic needs other than housing. Use
this figure as the population mean and assume that population
standard deviation is $75.00.
What is the probability that the mean expenditure for a sample
of 35 students is within $20 of the population mean? What
assumption do you need to make for this calculation?
What is the probability that the mean expenditure for a sample
of 50 students is within $20...
The time married men with children spend on child care averages 6.0 hours per week (Time,...
The time married men with children spend on child care averages
6.0 hours per week (Time, March 12, 2012). You belong to a
professional group on family practices that would like to do its
own study to determine if the time married men in your area spend
on child care per week differs from the reported mean of 6.0 hours
per week. A sample of 40 married couples will be used with the data
collected showing the hours per week...
The time married men with children spend on child care averages 6.4 hours per week {Time,...
The time married men with children spend on child care averages
6.4 hours per week {Time, March 12, 2012). You belong lo a
professional group on family practices that would like to do its
own study to determine if the time married men in your area spend
on child care per week differs from the reported mean of 6.4 hours
per week. A sample of 40 married couples will be used with the data
collected showing the hours per week...
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