Differences in Data Statistics

BLANK is the science of collecting, organizing analyzing, and interpreting data in order to make decisions.

• Data

• population

• statistics

• sample

Before you can begin calculating the variance, you must first:

• find the mean

• find the median

• find the mode

• find the range

Once you've calculated the mean, and listed the values in a table, what is the next step to calculating the variance?

• Square each value in the data set

• Subtract each value in the data set from the mean

• Subtract the mean from each value in the data set

• Add the mean to each value in the data set

After subtracting the mean from each value in the data set, the next step is to find the sum of those differences.

• True, then square that sum.

• False. Square the differences, then find the sum.

Calculate the sum of the square of the difference. (That is, steps 2, 3, and 4 ... Σ(x - μ)²

• 145.5

• 150

• 12

Last step... What is the variance?

• 24.25

• 29.1

• 2

• 4.9

Now, calculate the standard deviation.

• 12.1

• 21170.25

• 600.25

• 4.9

Order the dot plots from least to greatest standard deviation.

• A, D, C, B

• B, C, D, A

• A, D, B, C

• B, C, A, D

What value is the upper quartile (Q3)?

• 55

• 88

• 80

• 75