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Chapter 1: Q 84. (page 70)
House prices: The mean and median selling prices of existing single-family homes sold in November were and . Which of these numbers is the mean and which is the median? Explain how you know.
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Popular colors鈥攈ere and there Favorite vehicle colors may differ among countries. The side-by-side bar graph shows data on the most popular colors of cars in for the United States and Europe. Write a few sentences comparing the two distributions.
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
Buying music online Young people are more likely than older folk to buy music online. Here are the percent's of people in several age groups who bought music online in :
(a) Explain why it is not correct to use a pie chart to display these data.
(b) Make a bar graph of the data. Be sure to label your axes and title your graph.
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.
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
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