Chapter 3

sk=0.01

very nearly symmetrical

What would the location of the 83rd percentile be for a data set with 40 observations? Multiple choice question. 40.00 32.00 34.03 33.20

34.03

Which one of the following pairs of variables would be best-suited for a contingency table? Multiple choice question. Favorite Color and Gender Miles per gallon and Car Weight Size of House and Price of House Hours Studied and Test Grade

Favorite Color and Gender

3/4

3rd quartile

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

5.61

4/5

8th decile

Identify the shape of the distribution shown in the picture. Multiple choice question. Bimodal Negatively Skewed Positively Skewed Symmetrical

Bimodal

Which of the following is true regarding dot plots and histograms? Select all that apply. Multiple choice question. Dot plots work better for large data sets. Histograms are easier to construct. Dot plots do not lose the identity of individual observations.

Dot plots do not lose the identity of individual observations.

Which of the following statements describe a feature of a scatter diagram? Select all that apply. Multiple select question. The data points are connected by a line to make a polygon. One variable is scaled on the horizontal axis and the other is scaled on the vertical axis The vertical axis shows the frequency of occurrence of each set of observations. Each paired observation is represented by a single dot

One variable is scaled on the horizontal axis and the other is scaled on the vertical axis Each paired observation is represented by a single dot

Contingency tables are used for summarizing data of what level? Select all that apply. Interval Ordinal Nominal Ratio

Ordinal Nominal

If a set of data exhibits significant positive skewness, then which of the following would be expected of Pearson's coefficient of skewness? The coefficient should be much larger than 3. The coefficient should be less than 0. The coefficient should be close to 0. The coefficient should be close to 3.

The coefficient should be close to 3.

Dot plots allow one to observe which of the following? Select all that apply. Multiple select question. The shape of a distribution. The spread in a distribution. The center of a distribution. The relationship between two nominal variables.

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

What is the measure of position called below which 75% of the observations occur? Multiple choice question. The third quartile The third decile One standard deviation above the mean, The 25th percentile

The third quartile

10 matches

deciles

1/2

median

1/5

20th percentile

sk=2.60

Large positive skewness

2

median

100

percentiles

4

quartiles

For the following ordered set of data, find the 90th percentile. 0, 2, 3, 5, 5, 6, 8, 10, 10, 11, 12, 14, 16, 20, 23 23 14.4 20 21.2

21.2

For a given data set, suppose Q1 = 70, Q2 = 80, Q3 = 100. Which of the following is true about outliers? An observation of 140 would be an outlier. An observation less 70 or greater than 100 would be an outlier. An observation less than 100 would be an outlier. An observation of 20 would be an outlier.

An observation of 20 would be an outlier.

When you create a dot plot, you do which of these operations? Select all that apply. Multiple select question. Add a vertical axis showing frequency of observations. Connect adjacent dots to create a polygon. Place a dot along a horizontal scale for each observation. "Pile up" dots that are too close to show separately.

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

First Quartile

Separates the bottom 25% of the data from the upper 75%

Which one of these statements is not part of the description of a scatter diagram? Multiple choice question. The data points are connected to create a graph. Each observation is measured with two variables. One variable is scaled on the horizontal axis, the other on the vertical axis. It may show a relationship or lack of relationship between two variables.

The data points are connected to create a graph.

sk=1.83

Moderate positive skewness

Identify the shape of the distribution shown in the picture. Multiple choice question. Positively Skewed Bimodal Symmetrical Negatively Skewed

Positively Skewed

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%

The interquartile range is a measure of dispersion usually used along with the median. What is the definition of interquartile range? Multiple choice question. The number of observations in a quartile. The distance between the first and second quartile. The size of a quartile. The distance between the first and third quartile.

The distance between the first and third quartile.

sk=-1.52

Moderate negative skewness

Which of the following is not a measure of position? Multiple choice question. 75th decile standard deviation the mean first quartile

standard deviation

Each of the following is a measure of position in a set of data except: Multiple choice question. the standard deviation the quartiles the deciles the median

the standard deviation

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? Multiple choice question. There would be two asterisks plotted to indicate outliers at 20 and 24. There would be no asterisks plotted, indicating no outliers. There would be three asterisks plotted to indicate outliers at 20, 24, and 28. There would be one asterisk plotted to indicate an outlier at 20.

There would be two asterisks plotted to indicate outliers at 20 and 24.

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? Multiple choice question. Nothing can be said about the skew of the distribution. The distribution is negatively skewed. The distribution is positively skewed. The distribution is symmetrical.

The distribution is negatively skewed.

For the scatter diagram shown, how would you characterize the relationship between the variables? Multiple choice question. No relationship Strong negative relationship Strong positive relationship Weak relationship

Strong negative relationship

Which of the following are features of a dot plot? Select all that apply. Multiple select question. A horizontal line indicating the possible values of the data. Dots "piled up" for observations very close together. One dot for each observation. A line connecting the dots that represent individual observations.

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