A study at 35 large city high schools gives the following back-to-back stemplot

Question

A study at 35 large city high schools gives the following back-to-back stemplot of the percentages of students who say they have tried alcohol. Which of the following does not follow from the above data? (A) In general, the percentage of students trying alcohol seems to have increased from 1995-96 co 1998-99. (B) The median alcohol percentage among the 35 schools increased from 1995-96 to 1998-99. (C) The spread between the lowest and highest alcohol percentages decreased from 1995-96 to 1998-99. (D) For both school years in most of the 35 schools, most of the students said they had tried alcohol. (E) The percentage of students trying alcohol increased in each of the schools between 1995-96 and 1998-99.

Explanation / Answer

Median for years 1995-96 is 59% and for 1998-99 is 73%.

That is option B is correct.

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Option A is correct because stem-and-leaf display for 1995-96 is skewed to left more.

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Option C, D is also correct.

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We cannot conclude the percentage oof studnets increased in each school. Hence, option E is incorrect.

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