ch 4

When you create a dot plot, you do which of these operations? Select all that apply.

"Pile up" dots that are too close to show separately. Place a dot along a horizontal scale for each observation.

Match the measure of position to the number of parts into which it divides a set of observations.

100, percentiles 10 deciles 4 quartiles 2 median

Which one of the following pairs of variables would be best-suited for a contingency table?

Favorite Color and Gender are nominal or ordinal scale

Match the quartiles on the left with their definition on the right.

First Quartile matches Separates the bottom 25% of the data from the upper 75% Second Quartile Separates the bottom 50% of the data from the upper 50% Third Quartile Separates the bottom 75% of the data from the upper 25%

What statements below describe the relative use of dot plots and histograms? Select all that apply.

Histograms are more useful for large data sets. Dot plots are most useful for small data sets.

What would the location of the 11th percentile be for a data set with 50 observations?

Reason: (50+1)(11/100)=5.61

For the following ordered set of data, find the 60th percentile. 0, 2, 3, 5, 5, 6, 8, 10, 10, 11, 12, 14, 16

Reason: L60= (13 + 1) 6010060100 = 8.4 The 60th percentile is 40% of the way from the 8th observation to the 9th observation. Since the 8th and 9th observations are the same, the 60th percentile is 10.

Which one of these statements is not part of the description of a scatter diagram?

The data points are connected to create a graph.

Dot plots allow one to observe which of the following? Select all that apply.

The shape of a distribution. The center of a distribution. The spread in a distribution.

In the contingency table shown, which dealership had more than half of their sales above median profit?

Tionesta 26/43 above median

Suppose a given data set has the following characteristics: Minimum value: 120 Q1: 160 Q2: 190 Q3: 200 Maximum Value: 220 Which of the following is true about the distribution of the data?

he distribution is negatively skewed.

For a given data set, suppose Q1 = 40, Q2 = 45, Q3 = 50. Also, suppose that the three smallest observations are 20, 24, and 28. Which of the following is true about the box plot for this data set?

here would be two asterisks plotted to indicate outliers at 20 and 24 .Anything below 25 is an outlier. 40 - 1.5 * (50-40) = 25

Which of the following are features of a dot plot? Select all that apply.

Dots "piled up" for observations very close together. A horizontal line indicating the possible values of the data. One dot for each observation.