Practice Statistics Quiz

(Actual quiz will be worth 10 Points)

Ten subjects participated in a study on emotions. Subjects were randomly beeped four times a day for one week. Each time they were beeped, subjects were asked to record whether they were feeling happy. Listed below is the number of times each of the ten subjects reported being happy.

4, 5, 7, 3, 4, 3, 9, 5, 6, 4

Calculate the following statistics:

a) Mean__________

b) Median__________

c) Mode__________

d) Range__________

e) Variance__________

f) Standard Deviation__________

g) Explain in a sentence or two the meaning of the term "standard deviation." In other words, for a distribution of scores, what does the "standard deviation" measure or represent? Do not put down a formula. I’m looking for a written explanation that conveys your understanding of this concept.

ANSWERS

a) 5

b) 4.5

c) 4

d) 6

e) 3.2

f) 1.79

g) For any group of numbers, the standard deviation represents the extent to which the numbers deviate or differ from the mean of those numbers.