3. Describing Data Numerically

[DATA] Wait Time The following data represent the wait time (in minutes) for a random sample of 40 visitors to Disney’s Dinosaur Ride in Animal Kingdom.

a. Determine and interpret the quartiles. b. Check the data set for outliers.

True or False? In Exercises 7–10, determine whether the statement is true or false. If it is false, rewrite it as a true statement.

The second quartile is the mean of an ordered data set.

In Problems 3 and 4, (a) identify the shape of the distribution and (b) determine the five-number summary. Assume that each number in the five-number summary is an integer.

[DATA] Fraud Detection As part of its “Customers First” program, a cellular phone company monitors monthly phone usage. The program identifies unusual use and alerts the customer that their phone may have been used by another person. The data below represent the monthly phone use in minutes of a customer enrolled in this program for the past 20 months. The phone company decides to use the upper fence as the cutoff point for the number of minutes at which the customer should be contacted. What is the cutoff point?

You Explain It! Percentiles Explain the meaning of the following percentiles. Source: National Center for Health Statistics. a. The 5th percentile of the weight of males 36 months of age is 12.0 kg. b. The 95th percentile of the length of newborn females is 53.8 cm.

 Morningstar is a mutual fund rating agency. It ranks a fund’s performance by using one to five stars. A one-star mutual fund is in the bottom 10% of its investment class; a five-star mutual fund is at the 90th percentile of its investment class. Interpret the meaning of a five-star mutual fund.