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Chapter 1: Q 107. (page 73)
If a distribution is skewed to the right with no outliers,
(a) mean median. (d) mean > median.
(b) mean median. (e) We can鈥檛 tell without examining the data.
(c) mean median.
The correct option is (d) mean median.
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Researchers from Amherst College studied the relationship between varieties of the tropical flower Heliconia on the island of Dominica and the different species of hummingbirds that fertilize the flowers. Over time, the researchers believe, the lengths of the flowers and the forms of the hummingbirds鈥� beaks have evolved to match each other. If that is true, flower varieties fertilized by different hummingbird species should have distinct distributions of length. The table below gives length measurements (in millimeters) for samples of three varieties of Heliconia, each fertilized by a different species of hummingbird. Do these data support the researchers鈥� belief? Follow the four-step process
Choose a graph What type of graph or graphs would you plan to make in a study of each of the following issues at your school? Explain your choices.
(a) Which radio stations are most popular with students?
(b) How many hours per week do students study?
(c) How many calories do students consume per day?
Which of the following bar graphs is equivalent to the pie chart in Question T1.2?
The National Survey of Adolescent Health interviewed several thousand teens (grades to ). One question asked was 鈥淲hat do you think are the chances you will be married in the next ten years?鈥� Here is a two-way table of the responses by gender:
What percent of females thought that they were almost certain to be married in the next ten years?
(a) About (c) About (e) About
(b) About (d) About
El Ni帽o and the monsoon It appears that El Ni帽o, the periodic warming of the Pacific Ocean west of South America, affects the monsoon rains that are essential for agriculture in India. Here are the monsoon rains (in millimeters) for the strong El Ni帽o years between and
(a) To make a stem plot of these rainfall amounts, round the data to the nearest 10, so that stems are hundreds of millimeters and leaves are tens of millimeters. Make two stem plots, with and without splitting
the stems. Which plot do you prefer?
(b) Describe the shape, center, and spread of the distribution.
(c) The average monsoon rainfall for all years from to is about millimeters. What effect does El Ni帽o appear to have on monsoon rains?
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