A sample of n = 15 scores ranges from a high of X = 11 to a low of X = 3. If these scores are placed ...

A sample of n = 15 scores ranges from a high of X = 11 to a low of X = 3. If these scores are placed in a frequency distribution table, how many X values will be listed in the first column of that table?
 
  A) 8
  B) 9
  C) 11
  D) 15

Question 2

An independent-measures study with n = 6 in each sample, produces a sample mean difference of 4 points and a pooled variance of 12.What is the value for the t statistic?
 
  A) 1
  B) 2
  C) 4/6
  D) 4/8

Question 3

For a negatively skewed distribution, the mean usually has a larger value than either the median or the mode.
 
  Indicate whether the statement is true or false

Question 4

Two samples, each with n = 6 subjects, produce a pooled variance of 20.Based on this information, what is the estimated standard error for the sample mean difference?
 
  A) 20/6
  B) 20/12
  C) The square root of (20/6 + 20/6)
  D) The square root of (20/5 + 20/5)