Which of the following statements is correct?

Which of the following statements is correct?
 a. Measures of position are used to describe the position a specific data value possesses in relation to the rest of the data.
  b. Quartiles and percentiles are two of the most popular measures of position.
  c. Quartiles are values of the variable that divide the ranked data into 4 equal subsets called quarters.
  d. All of the above.

Q. 2

For a normal distribution, a value that is two standard deviations below the mean would be closer to which of the following?
 a. Third percentile
  b. First quartile
  c. Fortieth percentile
  d. Median

Q. 3

Which of the following types of graphs would not be good for qualitative data?
 a. Box-and-whiskers display
  b. Circle graph
  c. Bar graph
  d. Pareto diagram

Q. 4

Which of the following statements is false?
 a. The measures of dispersion include the range, variance, and standard deviation.
  b. The numerical values of measures of dispersion describe the amount of spread, or variability that is found among the data values.
  c. Closely grouped data have relatively small measures of dispersion values, and more widely spread-out data have larger values.
  d. None of the above

Q. 5

Which of the following is the weakest measure of dispersion?
 a. Range
  b. Variance
  c. Standard deviation
  d. None of them

Q. 6

The difference between the largest and smallest values in an ordered array is called the:
 a. standard deviation
  b. variance
  c. interquartile range
  d. range

Q. 7

Which of the following is a correct statement?
 a. The mean is a measure of the deviation in a data set.
  b. The standard deviation is a measure of dispersion.
  c. The range is a measure of central tendency.
  d. The median is a measure of dispersion.