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Get Full Access to Statistics: Informed Decisions Using Data - 5 Edition - Chapter 6.2 - Problem 43
Get Full Access to Statistics: Informed Decisions Using Data - 5 Edition - Chapter 6.2 - Problem 43

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# ?On-Time Flights According to flightstats.com, American Airlines flights from Dallas to Chicago are on time 80% of the time. Suppose 100 flights are ra

ISBN: 9780134133539 240

## Solution for problem 43 Chapter 6.2

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Problem 43

On-Time Flights According to flightstats.com, American Airlines flights from Dallas to Chicago are on time 80% of the time. Suppose 100 flights are randomly selected.

(a) Compute the mean and standard deviation of the random variable X, the number of on-time flights in 100 trials of the probability experiment.

(b) Interpret the meaning.

(c) Would it be unusual to observe 75 on-time flights in a random sample of 100 flights from Dallas to Chicago? Why?

Step-by-Step Solution:

Step 1 of 5) On-Time Flights According to flightstats.com, American Airlines flights from Dallas to Chicago are on time 80% of the time. Suppose 100 flights are randomly selected. (a) Compute the mean and standard deviation of the random variable X, the number of on-time flights in 100 trials of the probability experiment. (b) Interpret the meaning. (c) Would it be unusual to observe 75 on-time flights in a random sample of 100 flights from Dallas to Chicago Why We use the notation xa 2 to denote the critical x2 @value for which the area under the chi-square distribution to the right of xa 2 is a. For example, the area under the chi-square distribution to the right of x0.10 2 is 0.10. Test Hypotheses about a Population Standard Deviation.

Step 2 of 5

Step 3 of 5

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