### Describe their data with a graph and a few sentences

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Acid rain. Two researchers measured the pH (a scale on which a value of 7 is neutral and values below 7 are acidic) of water collected from rain and snow over a 6-month period in Allegheny County, PA. Describe their data with a graph and a few sentences:

#### Comment on the usefulness and appropriateness of the display

At a recent sales meeting, one of the staff presented a histogram of the zip codes of the last 500 customers, so that the staff might understand where sales are coming from.

#### What can these statistics tell you about the company’s sales

At a recent sales meeting, one of the staff presented a histogram of the zip codes of the last 500 customers, so that the staff might understand where sales are coming from.

#### Where do these plots violate the rules for statistical graph

Deaths 2003. A National Vital Statistics Report (www.cdc.gov/nchs/) indicated that nearly 300,000 black Americans died in 2003, compared with just over 2 million white Ameri

#### Write a brief report discussing what these data show

Marriage age. In 1975, did men and women marry at the same age? Here are boxplots of the age at first marriage for a sample of U.S. citizens then. Write a brief report discu

#### Describe this distribution

Old Faithful. It is a common belief that Yellowstone's most famous geyser erupts once an hour at very predictable intervals. The histogram below shows the time gaps (in minu

#### Explain the concept of independence

Teen drivers. In its Traffic Safety Facts 2005, the National Highway Traffic Safety Administration reported that 6.3% of licensed drivers were between the ages of 15 and 20,

#### Explain the discrepancy between a and b

The mean finishing time was 78.21 seconds, with a standard deviation of 1.03 seconds. If the Normal model is appropriate, what percent of the times should be within 0.5 seco

#### How this study demonstrates simpson''s paradox

The table in the next column summarizes the two groups by race and by presence of medical insurance when the child was born. Carefully explain how this study demonstrates Si