Question

Problem 2

A company is interested in knowing whether males and females differ in the amount of time they spend online. They ordered you to perform a study, and you reported that women spent a mean of 1,068 minutes per week online as compared to 1,398 minutes per week for men. The sample sizes were 100 each for women and men, and the population standard deviation for women was 50 minutes per week as compared to 75 minutes per week for men. You also know that α = 0.01.

What is your conclusion?

Select one:

a. There is not enough information for reaching a conclusion

b. There is no difference between men and women on time spent online

c. The time spent by men online is less than the time spent by women online

d. There is a significant difference between men and women on time spent online

Answer #1

A company is interested in knowing whether males and females
differ in the amount of time they spend online. They ordered you to
perform a study, and you reported that women spent a mean of 1,068
minutes per week online as compared to 1,398 minutes per week for
men. The sample sizes were 100 each for women and men, and the
population standard deviation for women was 50 minutes per week as
compared to 75 minutes per week for men....

Dr. Su is interested in whether males and females differ in
their verbal ability. She selects 5 males and 5 females to
participate in her study. She administers everyone a test of verbal
ability (scores ranging between 0-20, higher scores represent
higher ability). Here are the scores
Males: 10, 10, 12, 12, 16
Females: 9, 12, 12, 15, 17
Set up non-directional hypotheses for the independent t-test.
Provide the decision rule, illustrating with a drawing. Conduct an
independent t-test, report...

We are interested in comparing the percentage of females versus
males who admit to cheating on any college assignments or exams.
The following data was collected:
What is the 95% confidence interval for the difference in
proportion between women and men?
What is the test statistic?
Show all formulas used and steps of to resolve solutions.
Male or Female
Total Surveyed
Number who admit cheating
Female
150
19
Male
85
6

A statistics student wondered whether males spend more time
exercising on a treadmill at the gym than females. She went to
several different gyms on a single day in order to observe 40
people (20 males and 20 females) using a treadmill and record the
time on the display when they finished running. These running times
are given here in a back-to-back stem-and-leaf display:
male
female
30
6
0
62
5
25
810
4
08
833100
3
355
9621
2...

1. You are interested in whether the average lifetime of
Duracell AAA batteries is less than the average lifetime of
Energizer AAA batteries. You lay out your hypotheses as follows:
Null Hypothesis: μ1 ≥ μ2, Alternative
Hypothesis: μ1 < μ2 (Duracell = Group 1,
Energizer = Group 2). You perform an experiment on 20 randomly
selected Duracell AAA batteries and 40 randomly selected Energizer
AAA batteries and test them using a battery drainer. The Duracells
had an average lifetime of...

1.
I am interested in if there is a pay difference between men and
women nurses. Based on a study by ucsf male nurses used to make
more. I randomly sample and collect data. Assume you can
pool the variances. What is the p-value based on the following
sample...
Females Males
xbar 44,000 47,000
s 12,000 12,600
n 60 57
What is the p-value?
2.
I am interested in if there is a pay difference between men and
women nurses....

Suppose you are a civil engineer, specializing in traffic volume
control for the City of Grand Rapids. Your department has been
receiving a multitude of complaints about traffic wait times for a
certain intersection in the heart of downtown. To see if these
claims are valid, you want to monitor the true average wait time at
that intersection. Over the course of a few months, you record the
average number of minutes a car waits at the intersection between
4:00...

Question 7 (1 point)
You are interested in whether the average lifetime of Duracell
AAA batteries is less than the average lifetime of Energizer AAA
batteries. You lay out your hypotheses as follows: Null Hypothesis:
μ1 ≥ μ2, Alternative Hypothesis:
μ1 < μ2 (Duracell = Group 1, Energizer =
Group 2). You perform an experiment on 23 randomly selected
Duracell AAA batteries and 33 randomly selected Energizer AAA
batteries and test them using a battery drainer. The Duracells had
an...

A school psychologist is interested in whether time has changed
the problem with student parking that has been discussed for a few
years. As the student population has grown the psychologist fully
suspects that the time to find parking has become worse rather than
better for the student body. Over the past decade the average
amount of time to find parking for students is 15 minutes (µ=15).
The current sample’s information is as follows: M=19 minutes and a
S= 6...

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...

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