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Chapter 1: Q. 1.1 (page 14)
Use the data in the two-way table on page 12 to calculate the marginal distribution (in percents) of gender.
The Marginal Distribution for Female and for male marginal distribution is
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Earthquake intensities are measured using a device called a seismograph, which is designed to be most sensitive to earthquakes with intensities between 4.0 and 9.0 the Richter scale. Measurements of nine earthquakes gave the following readings:
where L indicates that the earthquake had an intensity below 4.0 and an H indicates that the earthquake had an intensity above 9.0. The median earthquake intensity of the sample is (a) 5.75. (c) 6.47. (e) Cannot be determined. (b) 6.00. (d) 8.70.
The histogram below shows the distribution of the per cent of women aged 15 and over who have never married in each of the 50 states and the District of Columbia.
The center of this distribution is in the interval
(a) to
(b) to
(c)
(d) to
(e)to
A class survey Here is a small part of the data set that describes the students in an AP Statistics class. The data come from anonymous responses to a questionnaire filled out on the first day of class.
a. What individual does with the data set describe
b. Identification of the quantitative variables
c. describe the individual in a highlighted row
Comparing car colours Favorite vehicle colours may differ among types of vehicles. Here are data on the most popular colours in for luxury cars and for SUVs, trucks, and vans.
(a) Make a graph to compare colours by vehicle type.
(b) Write a few sentences describing what you see.
The Freshman Survey asked first-year college students about their 鈥渉abits of mind鈥濃�攕pecific behaviors that college faculty have identified as being important for student success. One question asked students, 鈥淗ow often in the past year did you revise your papers to improve your writing?鈥� Another asked, 鈥淗ow often in the past year did you seek feedback on your academic work?鈥� The figure is a bar graph comparing male and female responses to these two questions.
What does the graph tell us about the habits of mind of male and female college freshmen?
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