Question

8.
If the outlier is excluded from the following data set, what happens to the mean?
250, 200, 308, 275, 32, 199, 220, 268, 290

It decreases.

It does not change.

It increases.
9.
Will the following list have a large or small Standard Deviation?
7, 6, 5, 8, 9, 1, 0, 4, 3, 2

not enough information is given

large

small
10.
Knowing that correlation coefficients have values between -1 and 1 and that the closer the value is to -1 or 1, the stronger the correlation -- which of the following correlation coefficients would represent the strongest correlation?

0.87

-0.5

0.02

-0.97
11.
Take a look at the following set of data: 21, 74, 42, 89, 51, 38, 207.
What word describes the data point 133?

outsider

outlier

median

range

Answer 1

8. It increases.
Removing the low outlier 32 raises the average (mean).

9. Large.
The values range widely (0–9), so the spread (standard deviation) is relatively large.

10. -0.97.
Its absolute value (0.97) is closest to 1, so it indicates the strongest correlation.

11. Outlier.
133 would be unusually large compared with the rest of the data, so it is an outlier.