Retailers are always interested in determining why a customer selected their store to make a purchase. A sporting goods retailer conducted a customer survey to determine why its customers shopped at the store. The results are shown in the bar chart below. What proportion of the customers responded that they shopped at the store because of the merchandise or the convenience?

• 35%

• 50%

• 65%

• 85%

True or False: A polygon can be constructed from a bar chart.

• True

• False

The figure below is the ogive for fat (in grams) for a sample of 36 pizza products where the upper boundaries of the intervals are: 5, 10, 15, 20, 25, and 30.

• 3%

• 14%

• 50%

• 75%

True or False: Given below is the scatter plot of the price/earnings ratio versus earnings per share of 20 U.S. companies. There appear to be a positive relationship between price/earnings ratio and earnings per share.

• True

• False

Which of the following statistics is not a measure of central tendency?

• Arithmetic mean.

• Median.

• Mode.

• Q3.

Which measure of central tendency can be used for both numerical and categorical variables?

• Arithmetic mean.

• Median.

• Mode.

• Geometric mean.

Which of the arithmetic mean, median, mode, and geometric mean are resistant measures of central tendency?

• The arithmetic mean and median only.

• The median and mode only.

• The mode and geometric mean only.

• The arithmetic mean and mode only.

When extreme values are present in a set of data, which of the following descriptive summary measures are most appropriate:

• CV and range.

• arithmetic mean and standard deviation.

• interquartile range and median.

• variance and interquartile range.

The smaller the spread of scores around the arithmetic mean,

• the smaller the interquartile range.

• the smaller the standard deviation.

• the smaller the coefficient of variation.

• All the above.

. According to the empirical rule, if the data form a "bell-shaped" normal distribution, _______ percent of the observations will be contained within 2 standard deviations around the arithmetic mean.

• 68.26

• 88.89

• 93.75

• 95.44