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Chapter 1: Q 110. (page 74)
What are all the values that a standard deviation can possibly take?
(a)
(b)
(c)
(d)
(e) Any number
The correct option is (a)
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Hit movies According to the Internet Movie Database, Avatar is tops based on box office sales worldwide. The following table displays data on several popular movies.
(a) What individuals does this data set describe?
(b) Clearly identify each of the variables. Which are quantitative? In what units do you think they are measured?
(c) Describe the individual in the highlighted row.
or, in general, compare related quantities.
Electoral votes To become president of the United States, a candidate does not have to receive a majority of the popular vote. The candidate does have to win a majority of the electoral votes that are cast in the Electoral College. Here is a stemplot of the number of electoral votes for each of the states and the District of Columbia.
(a) Make a boxplot of these data by hand. Be sure to check for outliers.
(b) Which measure of center and spread would you use to summarize the distribution鈥攖he mean and standard deviation or the median and IQR? Justify your answer.
You are interested in how much time students spend on the Internet each day. Here are data on the time spent on the Internet (in minutes) for a particular day reported by a random sample of 30 students at a large high school
(a) Construct a histogram of these data. (b) Are there any outliers? Justify your answer. (c) Would it be better to use the mean and standard deviation or the median and )12 to describe the center and spread of this distribution? Why?
Comparing AP scores The table below gives the distribution of grades earned by students taking the AP Calculus AB and AP Statistics exams in
(a) Make an appropriate graphical display to compare the grade distributions for AP Calculus AB and AP Statistics.
(b) Write a few sentences comparing the two distributions of exam grades.
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
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