EBook Problems EDA Shape

EBook Problems Set - Measures of Shape

Problem 1

46% of the likely voters in Los Angeles intend to vote for Mayor James. Suppose we take a random sample of 1000 likely Los Angeles voters. For every person in our sample who intends to vote for Mayor James we will record a "1". For every person who will not vote for the mayor, we will record a "0". Suppose we now make a histogram of our results. Which of the following is a good description of the histogram?

• Choose one answer.

(a) The distribution will have a spike at the value 0.46

(b) The distribution will be approximately normal

(c) The sample size is too small to tell

(d) The distribution will show about 46% of the replies at 1 and 54% at 0

Answer

 (d)

Problem 2

The Old Faithful Geiser in Yellowstone, Wyoming, erupts pretty regularly. After an eruption has occurred, one has to wait for the next eruption for some time. The waiting time has a histogram with two peaks or bumps (bimodal): one peak in the lower end and one in the upper end, with very little frequency in between. What does this suggest about the waiting time?

• Choose one answer.

(a) The waiting time does not depends on how long the last eruption was

(b) The waiting time should have been plotted with a bar graph, not a histogram

(c) There are two groups of waiting times, and in order to study this variable, we should analyze each group separately

Answer

 (a)

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