DESCRIBING DATA: NUMERICAL MEASURES

Part ISelect the correct answer and write the appropriate letter in the space provided. c1.The arithmetic mean is computed by

a.finding the value that occurs most often.

b.finding the middle observation and dividing by 2.

c.summing the values and dividing by the number of values.

d.selecting the value in the middle of the data set.

c2.To compute the arithmetic mean at least the

a.nominal level of measurement is required.

b.ordinal level of measurement is required.

c.interval level of measurement is required.

d.ratio level of measurement is required.

d3.The value that occurs most often in a set of data is called the

a.mean.

b.median.

c.geometric mean.

d.mode.

a4.What level of measurement is required to determine the mode?

a.at least nominallevel

b.at least ordinal

c.at least interval level

d.ratio

d5.For a symmetric distribution

a.the mean is larger than the median.

b.the mode is the largest value.

c.the mean is smaller than the median.

d.the mean and median are equal.

b6.Which of the following is not true about the arithmetic mean.

a.all the values are used in its calculation

b.half of the observations are always larger than the mean

c.it is influenced by a large value

d.it is found by summing all the values and dividing by the number of observations

a 7.In a negatively skewed distribution

a.the mean is smaller than the median.

b.the mean is larger than the median.

c.the mean and median are equal.

d.the median and the mode are equal.

b8.What is the lowest level of measurement required for the median?

a.nominalb.ordinal

c.intervald.ratio

__a___ 9.The Dow Jones Industrial Average increased from 6110 at the end of the first quarter in 1996 to 11,109 at the end of the first quarter in 2006. The annual rate of increase is best described by the

a.geometric mean.b.weighted mean.

c.median.d.mode.

a10.What is the shape of a frequency distribution with an arithmetic mean of 12,000 pounds, a median of 12,000 pounds, and a mode of 12,000 pounds?

a.flatb.symmetric

c.geometrically skewedd.positively skewed

d11.The mean deviation

a.is the average of all the values.

b.is the midpoint of the range.

c.is the average of how far each value is from the median.

d.is the average of how far each value is from the mean.

b12.The sum of the deviations from the mean is always

a.equal to the mean.

b.equal to zero.

c.always positive.

d.equal to the median.

b13.The square of the standard deviation is equal to

a.the mean.

b.the variance.

c.the median.

d.the mean deviation.

__d___ 14.What is the shape of a frequency distribution with an arithmetic mean of 800 pounds, median of 758 pounds, and a mode of 750 pounds?

a.negatively skewedb.symmetric

c.geometrically skewedd.positively skewed

__d___ 15.According to the Empirical Rule, about what percent of the observations are within 2 standard deviations of the mean?

a.50b.68

c.99.7d.95

CHAPTER 5 ASSIGNMENT

A SURVEY OF PROBABILITY CONCEPTS

Part ISelect the correct answer and write the appropriate letter in the space provided.

_b_____ 1.Which of the following statements regarding probability is always correct?

a.A probability can range from 0 to 1.

b.A probability close to 0 means the event is not likely to happen.

c.A probability close to 1 means the event is likely to happen.

d.all of the above are correct.

_a_____ 2.According to the classical definition of probability

a.All the events are equally likely.

b.The probability is based on hunches.

c.Divide the number of successes by the number of failures.

d.One outcome is exactly twice the other.

_b_____ 3.The observation...