Biology Forums - Study Force

You have a score of X = 75 on a statistics exam. The mean score for the class on the exam is  = 70. Which of the following values for the standard deviation would give you the highest position within the class?
 
  A)  = 1
  B)  = 5
  C)  = 10
  D)  = 12

Question 2

A researcher uses an analysis of variance to test for mean differences among three treatments with a sample of n = 12 in each treatment. The F-ratio for this analysis would have which df values?
 
  A) df = 2, 11
  B) df = 2, 33
  C) df = 2, 35
  D) df = 2, 36

Question 3

There is a six-point difference between two sample means. If the two samples have the same variance, then which of the following values for the variance would make the mean difference easiest to see in a graph showing the two distributions.
 
  A) s2 = 2
  B) s2 = 8
  C) s2 = 16
  D) s2 = 64

Question 4

An analysis of variance is used to evaluate the mean differences for a research study comparing four treatments with a separate sample of n = 8 in each treatment. If the data produce an F-ratio of F = 5.50, then which statistical decision is correct?
 
  A) Reject the null hypothesis with  = .05 but not with  = .01.
  B) Reject the null hypothesis with either  = .05 or  = .01.
  C) Fail to reject the null hypothesis with either  = .05 or  = .01.
  D) There is not enough information to make a statistical decision.

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Good timing, thanks!