What does the length of each line of a stem-and-leaf display represent?

What does the length of each line of a stem-and-leaf display represent?
 a. The percentage of observations in the interval represented by that stem.
  b. The number of observations in the interval represented by that stem.
  c. The total frequency of observations within or below that stem.
  d. The number of digits to the left of the decimal point.

Q. 2

The Spearman rank-correlation coefficient for 20 pairs of data when di2 = 50 is _____.
 a. .0063
  b. .0376
  c. .9624
  d. .9937

Q. 3

Decision alternatives are structured so that several could occur simultaneously.
  Indicate whether the statement is true or false

Q. 4

Which of the following is true about a stem-and-leaf display?
 a. You can recreate the original data set from it.
  b. Its shape resembles a histogram turned on its side.
  c. It provides an organized way to depict interval data.
  d. All of these choices are true.

Q. 5

If a null hypothesis that states that two populations are identical is rejected using a nonparametric test, then it is safe to assume that _____.
 a. neither the means nor the variances are equal
  b. the means of the populations are not the same
  c. the variances of the populations are not the same
  d. We cannot be sure of the way in which the populations differ from each other.

Q. 6

States of nature should be defined so that one and only one will actually occur.
  Indicate whether the statement is true or false