Inferences about Population, Dot & Box Plots 7.12AB

Waldo and Freddy caught fish one weekend. The dot plots show the lengths of the fish they caught. Which statement about the lengths of the fish caught by Waldo and Freddy appears to be true?

• The data for Waldo's fish and the data for Freddy's fish are skewed to the right.

• The median length of the fish caught by Waldo is greater than the median length of the fish caught by Freddy.

• The range of the length of the fish caught by Freddy is greater than the range of the length of the fish caught by Waldo.

• The data for Waldo's fish and the data for Freddy's fish are approximately symmetrical.

A college conducted a survey of randomly selected freshmen about their choice of major. The table shows the results of the survey. Which inference about all freshmen at this college is best supported by this information?

• The number of freshmen who chose English as their major is less than the number of freshmen who are Undecided on their major.

• The number of freshmen who chose Education as their major is greater than the number of freshmen who chose Science or Other as their major.

• The number of freshmen who chose Business or Education as their major is less than the number of freshmen who chose Science of Engineering as their major.

• The number of freshmen who chose Business as their major is greater than the number of freshmen who chose English as their major.

The manager of a music store surveyed a random sample of customers who shop in the store about their favorite type of music. The table shows the number of customers who selected each type of music.

• They are certain to select rock or pop music.

• The are less likely to select country or rap music than rock music.

• The are more likely to select country music than jazz, classical, or rap music.

• They are certain to select any type of music other than jazz music.

Parker conducted a random survey at the mall to determine the number of songs in each genre that were downloaded by 40 students. The results are shown in the bar graph. Base on the information in the graph, which inference about the general population of students is valid?

• Girls like country music more than all other genres combined.

• More girls than boys like rock music.

• Boys like country music more than rock music.

• Boys like rock music more than girls like rap music.

The box plots show the target heart rates of men 20-40 years old and men 50-70 years old. Which statement is best supported by the information in the box plots?

• The range of the data for men 20-40 years old is less than the range of the data for men 50-70 years old.

• The median of the data for men 20-40 years old is less than the median of the data for men 50-70 years old.

• The minimum target heart rate for men 20-40 years old is less than the minimum target heart rate for men 50-70 years old.

• The interquartile range of the data for men 20-40 years old is greater than the interquartile range of the data for men 50-70 years old.

The dot plots show the number of children's books purchased by customers at two differenct bookstores on one day. Which statement is supported by the information in the dot plots?

• The mode of the data for Store 2 is greater than the mode of the data for Store 1.

• The range of the data for Store 1 is greater than the range of the data for Store 2.

• The mean of the data for Store 1 is greater than the mean of the data for Store 2.

• The median of the data for Store 2 is greater than the median of the data for Store 1.

The dot plots show the numbers of miles Ian skated on several days in two different months. Which statement is supported by the information in the dot plots?

• The least number of miles Ian skated on a day in July is greater than the least number of miles Ian skated on a day in August.

• The median number of miles Ian skated each day in July is greater than the median number of miles Ian skated each day in August.

• The mode of the number of miles Ian skated each day in July is less than the mode of the number of miles Ian skated each day in August.

• The range of the number of miles Ian skated each day in July is less than the range of the number of miles Ian skated each day in August.

The box plot show the lengths of the songs on two digital music players in minutes. Which statement is best supported by the informaiton in the box plots?

• THe interquartile range of the data for Music Player X is equal to the interquartile range of the date for Music Player Y.

• The interquartile range of the data for Music Player X is greater than the interquartile range of the data for Music Player Y.

• The median length of the songs on Music Player X is equal to the median length of the songs on Music Player Y.

• The median length of the songs on Music Player X is less than the median length of the songs on Music Player Y.

The box plots show the data about the number of years that farmworkers have been employed at each of two farms. Which statement is best supported by the information in the box plots?

• The range of the data for Farm Y is equal to the range of the data for Farm X.

• The third quartile of the data for Farm Y is less than the third quartile of the data for Farm X.

• The median of the data for Farm Y is greater than the median of the data for Farm X.

• The first quartile of the data for Farm Y is greater than the first quartile of the data for Farm X.

The dot plots show the heights of the players on two basketball teams. Which statement is best supported by these data?

• The distributions of the data for Team A and Team B are approximately symmetrical.

• The median height of the players on Team B is less than the median height of the players on Team A.

• Team B has a greater range in player heights than Team A has.

• The mode height of the players on Team B is less than the mode height of the players on Team A.