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...

Extracted 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