Mad Variance and Standard Deviation

How do you calculate the standard deviation?

• Divide the variance by 2.

• Its a long process and I can't explain it right now.

• Find the mean and multiply it by the variance.

• Take the square root of the variance.

What is the standard deviation for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 6.89

• 10.1

• 7.26

• 9

Based on the two sets of scores given, which is a true conclusion?
Math Test: 85, 92, 88, 80, 91, 20
Science Test: 85, 92, 88, 80, 91, 74

• The standard deviation for the math test score is greater than for the science test score.

• The mean absolute deviation is greater than the standard deviation for the math test scores.

• The standard deviation for the science test scores is greater than for the math test scores.

• The mean absolute deviation is greater than the standard deviation for the science test scores.

If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall?

• -5

• -2

• 2

• 5

Steven knows that the z-score for a specific element within a set of data is - .97. Steven can conclude that the element falls approximately-

• one standard deviation above the man of the data set

• half of a standard deviation below the mean of the data set

• half of a standard deviation above the mean of the data set

• one standard deviation below the mean of the data set

A national achievement test is administered annually to 3rd graders. The test has a mean score of 100 and a standard deviation of 15. If Jane's z-score is 1.20, what was her score on the test?

• 82

• 88

• 100

• 118

What is the standard deviation for the data given:
{12, 13, 29, 18, 61, 35, 21}

• 293.67

• 15.87

• 17.14

• 41.98

Which data set has the largest standard deviation?

• Set 1

• Set 2

• Set 3

• Set 4

Find the MAD for following test grades:
100   80   70   90   100

• 30

• 52

• 15

• 10.4

Find the MAD for the following set: 85, 90, 68, 75, 79

• 79.4

• 6.48

• 32.4

• 79