Practice Quiz Chapter 03

. What tool is not used to describe the dispersion of a variable's distribution?

a) Mode

b) Percentiles

c) Quartiles

d) Range

e) Interquartile Range

. Which of the following is not a percentile of interest when a researcher calculates quintiles?

a) Fiftieth

b) Twentieth

c) Eightieth

d) Fortieth

e) Sixtieth

. The interquartile range is the difference between which two percentiles?

a) The 25th and the 75th

b) The 50th and the 75th

c) The 25th and the 50th

d) The 75th and 85th

e) The 55th and 75th

. What is the best way to visually depict the median, range and IQR?

a) Pictographs

b) Box plots

c) Pie graph

d) Doughnut graph

e) Frequency distribution table

. Which of the following is not a characteristic of the median?

a) Describes the centre of variables at the ordinal-level of measurement

b) Describes the centre of variables at the ratio-level of measurement

c) Describes the centre of variables at the nominal-level of measurement

d) Half the cases of a variable's dataset are below the median and half above

e) Its calculation depends on the ordering of a variable's dataset from lowest to highest

. A survey of 10 people collected the following responses (in months) to the question, "How long have you ever had to couch-surf for?": 2,2,2,3,3,4,4,1,1,5. What is the mode for this variable?

a) 5

b) 4

c) 1

d) 3

e) 2

. What is the median for this variable?

a) 4

b) 3

c) 5

d) 2.5

e) 1

. If a variable has two modes then it is known as what?

a) Uni-modal

b) Multi-modal

c) Solo-modal

d) Bimodal

e) Dicarious-modal

. How do you find the median by hand?

a) Add 1 to the total number of cases and divide by 2

b) Divide the total number of cases by 5

c) Multiply the total number of cases by 2 and add 1

d) Add 2 to the total number of cases and multiply by .5

e) Add .5 to the total number of cases and multiply by 2

. What is the mode for this variable? To answer this question successfully, please see the chart for Chapter 3 in the Student Image Bank.

a) There is no mode

b) Strongly Disagree

c) Disagree

d) Agree

e) Strongly Agree

. What is the median for this variable? To answer this question successfully, please see the chart for Chapter 3 in the Student Image Bank.

a) Agree

b) Strongly Agree

c) Disagree

d) Strongly Disagree

e) There is no median

. Calculate the thirtieth percentile. What is it? To answer this question successfully, please see the chart for Chapter 3 in the Student Image Bank.

a) Agree

b) There is no thirtieth percentile

c) Disagree

d) Strongly Agree

e) Strongly Disagree

. What percentile does the median represent?

a) Fifth

b) Fiftieth

c) Forty-ninth

d) Fifty-first

e) Twenty-fifth

. If there are 10 cases in a variable's dataset and you'e looking for the thirtieth percentile, at what position in the dataset is the cut-off for this percentile?

a) 3

b) 9

c) 33

d) .3

e) 13

. Which of the following are the percentiles of a dataset divided into four equal groups, or quartiles?

a) Twentieth, fortieth and sixtieth

b) Fifteenth, forty-fifth, and sixty-fifth

c) Twenty-fifth, fiftieth, and seventy-fifth

d) Twentieth, fortieth, and eightieth

e) Tenth, fortieth, and ninetieth

. The range is the distance between what?

a) The interquartile range and the maximum

b) The fiftieth and seventieth percentile

c) The median and the interquartile range

d) The twentieth and fortieth percentile

e) The minimum and maximum attributes of a variable

. Which of the following is an advantage of using the interquartile range to describe the distribution of a variable?

a) Makes it easier to calculate the median

b) It is strongly affected if there are a few cases with very high or very low attributes or values

c) The range becomes irrelevant

d) It is a better measure of the centre of the variable's distribution

e) It is not affected if there are a few cases with very high or very low attributes or values

. To find the cut-off point for the twenty-fifth percentile using cumulative percentages you must do what?

a) Subtract the fiftieth percentile from the seventy-fifth percentile

b) Find the attribute or value in a frequency distribution where the cumulative percentage first becomes higher than 25%

c) Subtract the median value from the range

d) Subtract the minimum from the maximum

e) It can't be calculated using cumulative percentages

. How do box plots display the range of a variable?

a) With a horizontal bar

b) The top and bottom of a box

c) With dots and a line connecting the dots

d) The width of the box

e) Its whiskers

. Which of the following is a measure of dispersion?

a) Median

b) Proportion

c) Percentage

d) Interquartile range

e) An attribute

. To calculate percentiles you must first multiply the proportion of whatever percentile you are calculating by the (# of cases + 1), then locate the attribute of the case at the number calculated.

a) True

b) False

. The cumulative percentage column of a frequency distribution table can also be used to find percentiles.

a) True

b) False

. To divide a variable into quartile groups, researchers find the twenty-fifth, fiftieth, and seventy-fifth percentile.

a) True

b) False

. It is possible to create a new variable by grouping together the attributes of another variable.

a) True

b) False

. It is possible to calculate the range for variables at the nominal-level of measurement.

a) True

b) False

. As a measure of dispersion, the range provides information about how cases are spread out between the minimum and maximum attributes or values.

a) True

b) False

. The interquartile range is affected by a few cases with very high or low attributes or values.

a) True

b) False

. Box plots may be used to visually depict the distribution of a variable at the ordinal- and ratio-level of measurement and the relationship between an ordinal-level or ratio-level variable and another categorical variable.

a) True

b) False

. The width of a box plot matters in its depiction.

a) True

b) False

. Box plots are used to identify "outliers," which are cases that do not appear to fit with the rest of the data.

a) True

b) False

. Most of the time variables only have one mode, but it is possible for a variable to be bi-modal or uni-modal.

a) True

b) False

. It is possible to describe the centre of a variable by calculating its median.

a) True

b) False

. The mode can be reported for variables at any level of measurement.

a) True

b) False

. When using box plots to show relationships for the dispersion of a single variable in two different groups, the dependent variable is the variable selected for analysis.

a) True

b) False

. In the visual depiction of a box plot representing the distribution of a variable in two different groups the dependent variable is displayed on the horizontal axis (X-axis) and the independent variable on the vertical (Y-axis).

a) True

b) False

. The mode is the least frequent attribute of a variable.

a) True

b) False

. The median can be calculated on variables at the ordinal- and ratio-level of measurement.

a) True

b) False

. To calculate the median you do not have to order the data from lowest attribute or value to the highest.

a) True

b) False

. The attribute where the cumulative percentage first rises above fifty percent is the median of the variable.

a) True

b) False

. Dispersion measures how a variable's cases are spread out across its attributes.

a) True

b) False

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