# Question: Are airline flight arrivals ever on time The general public

Are airline flight arrivals ever on time? The general public thinks they are always late—but are they? The Bureau of Transportation keeps records and periodically reports the findings. Listed here are the percentages of on-time arrivals at the 31 major U.S. airports during the month of April 2009.

a. Draw a dotplot of on-time performance data.

b. Draw a stem-and-leaf display of these data.

c. Find the 5-number summary and draw a box-and whiskers display.

d. Find P10 and P20.

e. Describe the distribution of on-time percentage, being sure to include information you learned in parts a through d.

f. Why would you be more likely to talk about the top 80% or 90% of the performance percentages than the middle 80% or 90%?

g. Are there airports whose on-time percentages appear to be quite different from the rest? How many? Which ones? Explain.

a. Draw a dotplot of on-time performance data.

b. Draw a stem-and-leaf display of these data.

c. Find the 5-number summary and draw a box-and whiskers display.

d. Find P10 and P20.

e. Describe the distribution of on-time percentage, being sure to include information you learned in parts a through d.

f. Why would you be more likely to talk about the top 80% or 90% of the performance percentages than the middle 80% or 90%?

g. Are there airports whose on-time percentages appear to be quite different from the rest? How many? Which ones? Explain.

## Relevant Questions

Major League Baseball stadiums vary in age, style, number of seats, and many other ways. But to the baseball players, the size of the field is of the utmost importance. Suppose we agree to measure the size of the field by ...An exam produced grades with a mean score of 74.2 and a standard deviation of 11.5. Find the z-score for each test score x: a. x = 54 b. x = 68 c. x = 79 d. x = 93 Which x value has the lower position relative to the set of data from which it comes? A: x = 28.1, where 25.7and s =1.8 B: x = 39.2, where =34.1 and s = 4.3 According to Chebyshev’s theorem, what proportion of a distribution will be within k _ 4 standard deviations of the mean? The empirical rule states that the 1, 2, and 3 standard deviation intervals about the mean will contain 68%, 95%, and 99.7%, respectively. a. Use the computer or calculator commands on page 90 to randomly generate a sample ...Post your question