Group of Representatives

1 . Of 250 adults who tried a new multi-grain cereal, “Wow!”, 187 rated it excellent; of 100 children sampled, 66 rated it excellent. What test statistic should we use?
Answer

z-statistic

Right one-tailed test

Left one-tailed test

Two-tailed test

2 . The weekly mean income of a group of executives is $1000 and the standard deviation of this group is $100. The distribution is normal. What percent of the executives have an income of $925 or less?
Answer

About 15%

About 85%

About 50%

About 23%

3.  A random variable from an experiment where outcomes are normally distributed
Answer

can have any value   between – ∞ and + ∞.

can have only a few   discrete values.

can have a mean of 0   and a standard deviation of 1.

can have no values.

4) Which of the following is true in a normal distribution?
 Answer

Mean equals the mode   and the median

Mode equals the median

Mean divides the   distribution into two equal parts

All of the above are   correct

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