Question

The
following contingency table shows the number of adults with credit
scores above and below 725 as well as their material status

Answer #1

A sample of 300 adults is selected. The contingency table below
shows their registration status
and their preferred source of information on current events.
Preferred source of information
Television Newspapers Radio Internet
---------------------------------------------------------------------------------------------------------------------
Voting registration Registered 40 50 45 65
status Not registered 40 60 25 75
---------------------------------------------------------------------------------------------------------------------
Is the preference for Television as the source of current
information independent of the voting
registration status? Explain.

Fill in the cells with. “?” in the following table
Generic Contingency
Disease Status
Exposure Status
Yes
No
Total
Yes
A=?
6
?
No
11
28
?
Total
=?
?
76

21) The table below shows scores for 12 randomly selected
students and their scores on the 1st and the 2nd SAT
Students
Scores on the 1st SAT
Scores on the 2nd Sat
1
392
532
2
421
523
3
439
427
4
340
607
5
493
444
6
457
490
7
396
428
8
400
524
9
510
532
10
409
397
11
413
550
12
339
357
a) At a 0.05, is there enough evidence to conclude that the...

) The table shows the number of smokers in a random sample of
500 adults aged 20-24 and the number of smokers in a random sample
of 450 adults aged 25-29. Assume that you plan to use a
significance level of α = 0.10 to test the claim that p1 ≠ p2. Find
the critical value(s) for this hypothesis test. Do the data provide
sufficient evidence that the proportion of smokers in the 20 -24
age group is different from...

The table below shows the scores of a group of students on a
10-point quiz.
Test Score
Frequency
3
3
4
3
5
5
6
2
7
2
8
3
9
0
10
2
The mean score on this test is:
The median score on this test is:

For a contingency table, which of the following is true?
The observed frequencies must equal the corresponding expected
frequencies.
The classification schemes must be independent in order to
calculate the expected frequencies.
The number of rows and columns are equal.
In an r x c contingency table, the number of degrees of freedom
of the Chi Square statistic is r x c.

Fill in the following contingency table and find the number of
students who both read mysteries AND read comics. Students read
mysteries do not read mysteries Total read comics 32 do no tread
comics 61Total 70 57

The contingency table below shows the results of a survey of
video viewing habits by age. Video Viewing Platform Preferred
Viewer Age Mobile/Laptop Device TV Screen Row Total 18–34 39 24 63
35–54 14 14 28 55+ 2 7 9 Column Total 55 45 100 Find the following
probabilities or percentages: (a) Probability that a viewer is aged
18–34. (Round your answer to 2 decimal places.) Probability (b)
Probability that a viewer prefers watching videos on a TV screen.
(Round...

The contingency table below shows the results of a survey of
video viewing habits by age.
Video Viewing Platform Preferred
Viewer Age
Mobile/Laptop Device
TV Screen
Row Total
18–34
40
23
63
35–54
12
12
24
55+
5
8
13
Column Total
57
43
100
Find the following probabilities or percentages:
(a) Probability that a viewer is aged 18–34.
(Round your answer to 2 decimal places.)
Probability
(b) Probability that a viewer prefers watching videos on a
TV...

Suppose that the following table contains the complete
probability distribution for the number of credit cards owned by
adults in a certain country. Complete parts a and b to the
right.
Number_of_Credit_Cards
Probability
0
0.29
1
0.26
2
0.11
3
0.09
4
0.08
5
0.06
6
0.05
7
0.03
8
0.02
9
0.01
a) compute the mean number of credit cards:
b) compute the standard deviation.

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