Answer these questions
Name ___________________________________ Roll No__________
Part I Select the correct answer and write the appropriate letter in the space provided
_____ 1. A grouping of data into classes giving the number of observations in each class is called a(an)
a bar chart.
b. frequency distribution.
c. pie chart.
d. cumulative frequency distribution.
______ 2. The distance between consecutive lower class limits is called the
a. class interval.
b. frequency distribution.
c. class midpoint.
d. class frequency.
______ 3. The class midpoint is
a. equal to the number of observations.
b. found by adding the lower class limits of two consecutive classes and dividing by 2.
c. equal to the class interval.
d. all of the above.
______ 4. The number of observations in a particular class is called the
a. class interval.
b. class frequency.
c. frequency distribution.
d. none of the above.
______ 5. A bar chart is used most often when
a. you want to show frequencies as compared to total observations.
b. you want to show frequencies by class intervals.
c. you want to display frequencies by category.
d. you want to organize data along certain time interval.
______ 6. In a relative frequency distribution
a. the class frequencies are divided by 100.
b. the data are related to each other rather than mutually exclusive.
c. the class frequency is divided by the total number of observations.
d. the frequencies are added together to give a relative set of numbers.
______ 8. The suggested interval size of the class intervals for a histogram can be estimated by:
a. consecutive lower class limits divided by 2.
b. consecutive lower class limits divided by the total number of observations.
c. using the formulas: 
CHAPTER 3 ASSIGNMENT
Describing Data: numerical Measures
Name ____________________________________Roll No _______________
Part I Select the correct answer and write the appropriate letter in the space provided.
______ 1. The arithmetic mean is computed by
a. finding the value that occurs most often.
b. finding the middle observation and dividing by 2.
c. summing the values and dividing by the number of values.
d. selecting the value in the middle of the data set.
______ 2. To compute the arithmetic mean at least the
a. nominal level of measurement is required.
b. ordinal level of measurement is required.
c. interval level of measurement is required.
d. ratio level of measurement is required.
______ 3. The value that occurs most often in a set of data is called the
a. mean.
b. median.
c. geometric mean.
d. mode.
______ 4. What level of measurement is required to determine the mode?
a. at least nominal level
b. at least ordinal
c. at least interval level
d. ratio
______ 5. For a symmetric distribution
a. the mean is larger than the median.
b. the mode is the largest value.
c. the mean is smaller than the median.
d. the mean and median are equal.
______ 6. Which of the following is not true about the arithmetic mean.
a. all the values are used in its calculation
b. half of the observations are always larger than the mean
c. it is influenced by a large value
d. it is found by summing all the values and dividing by the number of observations
______ 7. In a negatively skewed distribution
a. the mean is smaller than the median.
b. the mean is larger than the median.
c. the mean and median are equal.
d. the median and the mode are equal.
______ 8. What is the lowest level of measurement required for the median?
a. nominal b. ordinal
c. interval d. ratio
______ 9. The Dow Jones Industrial Average increased from 6110 at the end of the first quarter in 1996 to 11,109 at the end of the first quarter in 2006. The annual rate of increase is best described by the
a. geometric mean. b. weighted mean.
c. median. d. mode.
______ 10. What is the shape of a frequency distribution with an arithmetic mean of 12,000 pounds, a median of 12,000 pounds, and a mode of 12,000 pounds?
a. flat b. symmetric
c. geometrically skewed d. positively skewed
______ 11. The mean deviation
a. is the average of all the values.
b. is the midpoint of the range.
c. is the average of how far each value is from the median.
d. is the average of how far each value is from the mean.
______ 12. The sum of the deviations from the mean is always
a. equal to the mean.
b. equal to zero.
c. always positive.
d. equal to the median.
______ 13. The square of the standard deviation is equal to
a. the mean.
b. the variance.
c. the median.
d. the mean deviation.
______ 14. What is the shape of a frequency distribution with an arithmetic mean of 800 pounds, median of 758 pounds, and a mode of 750 pounds?
a. negatively skewed b. symmetric
c. geometrically skewed d. positively skewed
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