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Chapter 1: Q 3.3. (page 64)
The heights (in inches) of the five starters on a basketball team are
Show how to calculate the variance and standard deviation from the values in your table.
The sample variance is and standard deviation is
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Cool car colors The most popular colors for cars and light trucks change over time. Silver passed green in to become the most popular color worldwide, then gave way to shades of white in . Here is the distribution of colors for vehicles sold in North America in
(a) What percent of vehicles had colors other than those listed?
(b) Display these data in a bar graph. Be sure to label your axes and title your graph.
(c) Would it be appropriate to make a pie chart of these data? Explain.
An experiment was conducted to investigate the effect of a new weed killer to prevent weed growth in onion crops. Two chemicals were used: the standard weed killer (C) and the new chemical (W). Both chemicals were tested at high and low concentrations on a total of 50 test plots. The percent of weeds that grew in each plot was recorded. Here are some boxplots of the results. Which of the following is not a correct statement about the results of this experiment?
(a) At both high and low concentrations, the new chemical (W) gives better weed control than the standard weed killer (C).
(b) Fewer weeds grew at higher concentrations of both chemicals.
(c) The results for the standard weed killer are less variable than those for the new chemical.
(d) High and low concentrations of either chemical have approximately the same effects on weed growth.
(e) Some of the results for the low concentration of weed killer W show fewer weeds growing than some of the results for the high concentrate
Make a graph to display the marginal distribution. Describe what you see
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
Shopping spree A marketing consultant observed 50 consecutive shoppers at a supermarket. One variable of interest was how much each shopper spent in the store. Here are the data (in dollars), arranged in
increasing order:
(a) Round each amount to the nearest dollar. Then make a stem plot using tens of dollars as the stems and dollars as the leaves.
(b) Make another stem plot of the data by splitting stems. Which of the plots shows the shape of the distribution better?
(c) Write a few sentences describing the amount of money spent by shoppers at this supermarket.
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