Question

Cassie and Amir are trying to control the number of text
messages they send. They record the number they send every day in
April.

Cassie:

22, 21, 24, 20, 31, 19, 13, 23, 16, 12, 17, 15, 14, 11, 8, 24,
19, 14, 19, 27, 22, 26, 25, 20, 24,

I 8, 28, 12, 18, 22

Amir: 12, 8, 9, 3, 2, 12, 33, 28, 32, 28, 29, 13, 16, 14, 30,
26, 31, 32, 32, 13, 16, 26, 18, 32, 26, 9, 10, 2,

8, 16

Compare the two sets of data using a frequency polygon with
seven intervals starting at 0: Then, using the options of numbers
below, identify the

1. Range: _______

2. Minimum Value: _______

3. Maximum Value: ______

4. If the interval is 5, highest frequency mid-point (for
total text messages) is at _______

5.If the interval is 5, the first mid point is at
________

Answer bank: 33, 31, 7.5, 2.5, 22.5, 27.5, 2, 17.5, 12.5

Answer #1

Person
number
X
Value
Y
Value
Person number
X
Value
Y
Value
Person number
X
Value
Y
Value
1
24
30
11
39
42
21
21
27
2
42
53
12
60
65
22
33
29
3
20
27
13
34
40
23
25
27
4
31
30
14
24
26
24
22
25
5
22
24
15
51
57
25
28
33
6
46
47
16
80
83
26
34
40
7
52
60
17
28
27
27
53...

# of text messages sent yesterday
3 8 3 18 2 1 8 1 6 13 15 14 13 9 20 12 5 9 18 18 13 2 7 6 0 0 11
12 4 13 1 19 4 12 4 11 8 18 1 15 12 6 6 12 19 12 20 12 8 12
Test the following claim:
70% of individuals that send text messages send less than 10
messages per day, α = 0.01

The results of a sample of 372 subscribers
toWiredmagazine shows the time spent using the Internet
during the week. Previous surveys have revealed that the population
standard deviation is 10.95 hours. The sample data can be found in
the Excel test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
Develop a 95% confidence interval for the population mean
If the editors of Wiredwanted to have the...

____________________________________________
The results of a sample of 372 subscribers to Wired
magazine shows the time spent using the Internet during the week.
Previous surveys have revealed that the population standard
deviation is 10.95 hours. The sample data can be found in the Excel
test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
____________________________________________
Develop a 95% confidence interval for the population mean
____________________________________________
If the editors...

6. Using the class data (see Blackboard file - "Class Survey
Data - PSS-10 and GAS") calculate the correlation between the GAS –
Goal disengagement and the GAS – Goal reengagement scores. Write
the results in a statistical statement.
7. Using the class data calculate the correlation between the
GAS – Goal disengagement and the PSS-10 scores. Write the results
in a statistical statement.
8. Using the class data calculate the correlation between the
GAS – Goal reengagement scores and...

The Columbus Dispatch conducted a study. Two identical football,
one filled with helium and one filled with ordinary air, were used.
A casual observer was unable to detect a difference in the two
footballs. A novice kicker was used to punt the footballs. A trial
consisted of kicking both footballs in a random order. The kicker
did not know which football he was kicking. The distance of each
punt was recorded, then another trial was conducted. A total of 39...

A doctor discovers a particular disease and determines the life
expectancy is not good. He gathers the data for his patents and
posts it in the table below. The claims that the average life
expectancy once the disease presents itself is less than 15 days.
Check his claim and make an appropriate report about your findings
Patient Days till passing
1 24
2 23
3 13
4 20
5 10
6 18
7 13
8 14
9 24
10 25...

Studies are often done by pharmaceutical companies to determine
the effectiveness of a treatment program. Suppose that a new AIDS
antibody drug is currently under study. It is given to patients
once the AIDS symptoms have revealed themselves. Of interest is the
average length of time in months patients live once starting the
treatment. Two researchers each follow a different set of 40 AIDS
patients from the start of treatment until their deaths. The
following data (in months) are collected....

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process. If the variance of XYZ remains unchanged,
what should be the variance of ABC in order...

The paper "Lessons from Pacemaker Implantations" gave the
results of a study that followed 89 heart patients who had received
electronic pacemakers. The time (in months) to the first electrical
malfunction of the pacemaker was summarized in the table below.
20
14
8
25
22
26
29
8
17
28
22
25
6
22
15
20
17
8
20
22
15
24
14
13
11
6
30
22
27
14
24
7
15
6
14
27
15
29
25
18...

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