Question

For a 4-units class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 23 students, and the distribution of total study hours per week is bell-shaped with a mean of 12 hours and a standard deviation of 3 hours. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between hours and hours on Statistics each week. b) 95% of the students spend between hours and hours on Statistics each week. c) 99.7% of the students spend between hours and hours on Statistics each week.

Answer #1

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 23
students, and the distribution of total study hours per week is
bell-shaped with a mean of 14 hours and a standard deviation of 3.4
hours.
Use the Empirical Rule to answer the following questions.
a) 68% of the students spend between hours and hours on Statistics
each week.
b) 95% of the students spend between hours and...

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 24
students, and the distribution of total study hours per week is
bell-shaped with a mean of 13 hours and a standard deviation of 2.8
hours. Use the Empirical Rule to answer the following questions. a)
68% of the students spend between hours and hours on Statistics
each week. b) 95% of the students spend between hours and...

For a 4-unit class like Statistics, students should spend
average of 12 hours studying for the class. A survey was done on 20
students, and the distribution of total study hours per week is
bell-shaped with a mean of 13 hours and a standard deviation of 3.4
hours.
Use the Empirical Rule to answer the following questions.
a) 68% of the students spend between ____ hours and ____ hours on
Statistics each week.
b) 95% of the students spend between...

For
a 4-unit class like statistics, studensts should spend an aberage
of 12 hours studying for the class. A survey was done on 25
students , and the distribution of total study hours per week is a
bell shape with a mean of 14 hours and a standard deviation of of
2.6 hours.

1.) Calculate both the sample and the population standard
deviations using the data below.
x
14
20
26
18
6
24
Please show the following answers to 1 decimal
place.
Sample Standard Deviation (ss) =
Population Standard Deviation (σσ) =
Notice the different!
2.) The highway mileage (mpg) for a sample of 9 different models
of a car company can be found below.
20
27
35
49
35
43
22
28
40
Find the mode:
Find the midrange:
Find the...

A)Adult men have heights with a mean of 69.0
inches and a standard deviation of 2.8 inches. Find the height of a
man with a z-score of 0.8214 (to 4 decimal
places)
B)For a 4-unit class like Statistics, students
should spend average of 12 hours studying for the class. A survey
was done on 29 students, and the distribution of total study hours
per week is bell-shaped with a mean of 13 hours and a standard
deviation of 3.2 hours....

Statistics professor has 115 students in a statistics class and
would like to estimate the number of hours each student studying
for the last exam. A random sample of 41 students was found to
study an average of 7.3 hours with a standard deviation of 1.9
hours. The 95% confidence interval to estimate the average number
of hours studying for the exam is

According to the American Freshman, the number of hours that
college freshmen spend studying each week is normally distributed
with a mean of 7 hours and a standard deviation of 5.3 hours. Use
this data to answer the following:
a. Construct a 68-95-99.7 bell curve:
b. Find the hours studied 3 standard deviations above the mean:
__________
c. Find the hours studied 1 standard deviations below the mean:
__________
d. Find the percentage of the region with hours studied between...

Students at a liberal arts college study for an average of 10
hours per week with a standard deviation of 2 hours per week. The
distribution of their study time happens to be uni-modal, symmetric
and bell shaped. Approximately 68% of students study between 8 and
B hours a week.
What is the value of B? Please show steps and excel formula

UVA wants to estimate the average number of hours students spend
studying on campus each week. They sample 54 students. This sample
showed an average of 15.4 hours per week with a standard deviation
for the sample of 9.2 hours. They want a 90% confidence
interval
a) what is the 90% confidence interval? (give the interval, 3
decimal places)
b) what is the margin of error? (give the interval, 3 decimal
places)
c) write a sentence summarizing the meaning of...

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