2. A teacher gave an identical math test to her 1st and 2nd period classes. Here

Question

2. A teacher gave an identical math test to her 1st and 2nd period classes. Here are the distributions: Period 1 20 12 14 15 18 25 75 70 Period 2 80 15 85 75 68 20 90 80 Compute (for Periods 1 and 2) Range Which of the two distributions has the greater average distance of scores around the mean? Variance Standard Deviation Which of these distributions has the greatest range? Which of these distributions is positively skewed? Which of these distributions has the greatest variability between scores? Negatively skewed?

Explanation / Answer

Range=maximum-minimum

For first period=75-12=63

Second period=90-15=75

Variance=sum(x_i - x_bar)^2/n

For first class=586.109375,sd=24.21

For second class=762.859,sd=27.62

Sum(abs(x_i -x_bar))/n is required here

For first period=20.6875

For second=23.3125

So second class has more.

FIRST FOUR QUESTIONS ARE ANSWERED ONLY

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