Statistical Tests - Standard Deviation (Only for CPAC's)

Question 1

What is standard deviation

Answer 1

The spread around the mean

Question 2

What does a low standard deviation indicate

Answer 2

The data has a narrow range and that the points are closely grouped around the mean. Could indicate greater reliability.

Question 3

What does a high standard deviation indicate

Answer 3

That the data has a larger range and that the points are less well grouped around the mean. Could indicate lower reliability.

Question 4

What is the formula for standard deviation

Answer 4

s=√∑(x-y)²/n-1

Question 5

What is the x in the standard deviation

Answer 5

each value from the population, which needs to be inserted into (x-y)² individually and all the totals need to be added up

Question 6

What does the y stand for in the standard deviation

Answer 6

the mean of the population

Question 7

What does the n stand for in the standard deviation

Answer 7

The number of data points

Question 8

What should standard deviation present

Answer 8

A bell curve

Question 9

Do you have to calculate standard deviation in a test

Answer 9

No but will have to in CPAC’s