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Airport security The Transportation Security Administration (TSA) is responsible for airport safety. On some flights, TSA officers randomly select passengers for an extra security check prior to boarding. One such flight had 76passengers12in first class and 64 in coach class. Some passengers were surprised when none of the 10passengers chosen for screening were seated in first class. We can use a simulation to see if this result is likely to happen by chance.

(a) State the question of interest using the language of probability.

(b) How would you use random digits to imitate one repetition of the process? What variable would you measure?

(c) Use the line of random digits below to perform one repetition. Copy these digits onto your paper. Mark directly on or above them to show how you determined the outcomes of the chance process.

Short Answer

Expert verified

Part (a) The number of first-class passengers is the variable being measured.

Part (b) The number of first-class passengers is the variable being measured.

Part (c) The number of first-class passengers is the variable being measured.

Part (d) The number of first-class passengers is the variable being measured.

Step by step solution

01

Part (a) Step 1. Given Information   

The number of passengers on the trip was 76

The number of passengers in first-class is 12people.

64The number of people in the coach class is 64.

n=10travelers were chosen for screening. We'll need to create a simulation to assess if this outcome is likely to occur by chance.

02

Part (a) Step 2. Concept Used 

We can't foresee the outcomes of a chance process, yet they have a regular distribution over a large number of repetitions. According to the law of large numbers, the fraction of times a specific event occurs in numerous repetitions approaches a single number. The likelihood of a chance outcome is its long-run relative frequency. A probability is a number between 0 (never happens) and 1 (happens frequently) (always occurs).

03

Part (a) Step 3. Explanation   

Looking at the question, the following is the question of interest expressed in probability language: What are the chances that a random screening of 10 passengers includes none from first class out of 12 first class passengers and 64 coach class passengers? This is the question expressed in probabilistic terms.

04

Step 4  / 4Part (b) Step 1. Explanation

To simulate one repetition of the procedure using random digits, we shall perform as follows: As we know, numbers 01-12can represent first class passengers while 13-76can represent coach class people. Then, from a line of the random digits table, ten two-digit numbers could be selected, skipping repeated numbers and those from 77to100The number of first-class passengers in the group may then be counted. The number of first-class passengers is hence the variable being measured.

05

Part (c) Step 1. Explanation    

As in the question, the random digits are as follows: Choose the first two digits of the number. If the number is between01and 76, select the appropriate passenger; otherwise, disregard the number and proceed to the next two-digit number. This is explained as follows:

71Select passenger71

48Select passenger48

70鈬 Select passenger70

99鈬 Ignore

84Ignore

29Select passenger29

07鈬 Select passenger07

71鈬 Repeated thus ignore

48鈬 Repeated thus ignore

63鈬 Select passenger63

61鈬 Select passenger61

68鈬 Select passenger68

34鈬 Select passenger34

70鈬 Repeated thus ignore

52鈬 Select passenger52

Thus the numbers selected are as: 71,48,70,29,07,63,61,68,34,52.

06

Part (d) Step 1. Explanation   

Numbers 01-12might represent first-class passengers, whereas 13-46 could represent coach-class passengers, as we know. The first class passengers might then be measured by taking ten two-digit numbers from a line of the random digits database, skipping over repeated numbers and those from 77-100 When the exercise was repeated 100 times, none of the ten passengers picked were sat in first class 15 times. This could mean that the ten passengers chosen have a number between 13 and 76, which reflects coach class passengers, or a number between 77 and 100, which indicates that they are skipped. This can happen if ten numbers are chosen at random.

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