CHAPTER 4 Name

41. A survey of people who invest in mutual funds found that "average" amounts invested were $18,200 and$43,500. One of these numbers is the mean amount invested and one is the median.(a) $43,500 is the mean, because a few people with very large amounts invested pull up the mean but not themedian.(b) $43,500 is the median, because a few people with very large amounts invested pull up the median but notthe mean.(c) $43,500 is the mean, because the mean must always be at least as large as the median.(d) $43,500 is the median, because the distribution of amounts invested is skewed to the right.42. You measure the length in centimeters and the weight in grams of each of a litter of newly hatchedrattlesnakes. The standard deviation of the weights is measured in(a) grams(b) centimeters(c) grams squared(d) no units -- it's a pure number43. If a bar graph is to be accurate, it is essential that(a) the bars touch each other.(b) the bars be drawn vertically.(c) both horizontal and vertical scales be clearly marked in equal units.(d) the bars all have the same width.(e) the explanatory variable be plotted on the horizontal axis.44. The mean and the median of a distribution are measures of(a) the number of observations(b) association(c) variability or spread(d) center45. The 70th percentile of a distribution is(a) the number with 70% of the data below it(b) the number with 70% of the data above it(c) the number that is 70% of the average(d) 70% of the sample size46. If 30 is added to every number on a list, the only one of the following that is not changed is(a) the mean(b) the mode(c) the 75th percentile(d) the median(e) the standard deviation