51. The airline industry defines "no-shows" as passengers who have purchased a ticket but fail to arrive at the gate on time for departure. United Airlines operates many flights from Philadelphla to Dallas. The table below represents the observed number of no-shows that Occurred on a random sample of 120 flights between Philadelphla and Dallas this year, and experienced the no-show proportions last year. No-shows Observed 10 Proportion 0.05 1 18 0.15 26 0.20 3 32 0.30 4 20 0.20 5. 14 0.10 United Airlines would like to know if the proportions of no-shows has changed between last year and this year on flights between these two cities using a = 0.05. The test statistic for this sample is A. 4.28 B. 6.19 C. 7.50 D. 9.33

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51. The airline industry defines "no-shows" as passengers who have purchased a ticket but fail to
arrive at the gate on tme for departure. United Airlines operates many fiights from
Phladelphla to Dallas. The table below represents the observed number of no-shows that
occurred on a random sample of 120 flights between Philadelphla and Dallas this year, and
experienced the no-show proportions last year.
No-shows
Observed
Proportion
10
0.05
1
18
0.15
2.
26
0.20
32
20
0.30
0.20
4.
14
0.10
United Airlines would like to know if the proportions of no-shows has changed between last
year and this year on flights between these two cities using a = 0.05. The test statistic for
this sample is
A. 4.28
B. 6.19
C 7.50
D. 9.33
52. Suppose Bank of America would like to investigate if the credit score and income level of an
individual are independent of one another. Bank of America selected a random sample of 400
adults and asked them to report their credit score range and their income range. The following
contingency table presents these results.
Credit Score
Class
Less than 650.
650-750
More than 750
Income e $50000
24
c000 heeme 100.000
14
20
30
Income $150000
17,
22
The expected number of individuals with income less than $50,000 and a credit score between
650 and 750 is
A. 24.0
B. 26.0
C. 32.5
D. 52.0
53
. tabl
In the following
Transcribed Image Text:51. The airline industry defines "no-shows" as passengers who have purchased a ticket but fail to arrive at the gate on tme for departure. United Airlines operates many fiights from Phladelphla to Dallas. The table below represents the observed number of no-shows that occurred on a random sample of 120 flights between Philadelphla and Dallas this year, and experienced the no-show proportions last year. No-shows Observed Proportion 10 0.05 1 18 0.15 2. 26 0.20 32 20 0.30 0.20 4. 14 0.10 United Airlines would like to know if the proportions of no-shows has changed between last year and this year on flights between these two cities using a = 0.05. The test statistic for this sample is A. 4.28 B. 6.19 C 7.50 D. 9.33 52. Suppose Bank of America would like to investigate if the credit score and income level of an individual are independent of one another. Bank of America selected a random sample of 400 adults and asked them to report their credit score range and their income range. The following contingency table presents these results. Credit Score Class Less than 650. 650-750 More than 750 Income e $50000 24 c000 heeme 100.000 14 20 30 Income $150000 17, 22 The expected number of individuals with income less than $50,000 and a credit score between 650 and 750 is A. 24.0 B. 26.0 C. 32.5 D. 52.0 53 . tabl In the following
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