A scientist placed some bacteria in a sterile dish of agar. He counted the number of live bacteria ...

A scientist placed some bacteria in a sterile dish of agar. He counted the number of live bacteria at regular intervals afterward. He observed that at first the bacteria grew slowly at first, and then they increased very rapidly in number. Finally, the count leveled off and then declined rapidly as the food supply was used up. A graph of this relationship would be.
 
  a. U-shaped
  b. linear
  c. monotonic
  d. nonmonotonic

Question 2

A curve that never changes direction is called a(n) ________ curve.
 
  a. monotonic
  b. nonmonotonic
  c. U-shaped
  d. inverted

Question 3

Which is not true of a cumulative frequency distribution?
 
  a. It may be nonmonotonic.
  b. It begins at zero frequency.
  c. It indicates skewness of the distribution.
  d. The data points lie at the upper real limit of each interval.

Question 4

Which one of the following distributions is probably negatively skewed?
 
  a. family income in dollars per year
  b. scores on a very difficult test
  c. scores on a moderately difficult test
  d. scores on a very easy test