Standard Deviation

Question 1

Fill in the missing values in the formula. What is the variance?

Revolt · Accepted Answer

12.405

Question 2

Standard deviation: 2.08✔ 4.349.418.8353.44

Revolt · Accepted Answer

✔ 4.34

Question 3

A diver records the depths, in feet, of her dives. They are: 60, 58, 53, 49, 60 The mean of the data set is 56.

Revolt · Accepted Answer

What does the denominator evaluate to?: 5; The variance equals:: 18.8

Question 4

Sabine records the daily heights of a random sample of bamboo stalks, in inches. They are: 20, 19, 17, 16, 18, 15, 20, 21 Consider the formulas:

Revolt · Accepted Answer

Which formula should you use for variance?: A; Which formula should you use for standard deviation?: B

Question 5

Question 5

Revolt · Accepted Answer

4.5; 2.12

Question 6

Rainforest data: Mean = 7 σ2 = 12.405 σ ≈ 3.522 When using the formula zx = x − μ σ for the z-score for the 11.7 data point: x = μ = z11.7 ≈

Revolt · Accepted Answer

11.7; 7

Question 7

Is 11.7 within a z-score of 3?

Revolt · Accepted Answer

Yes because z < 3.

Question 8

Which statement is true of z?

Revolt · Accepted Answer

z is between 1 and 2 standard deviations of the mean.

Question 9

-1.30.4✔ 1.3X 3.3

Revolt · Accepted Answer

✔ 1.3

Question 10

The data set on the right represents a sample of the population✔ the population.

Revolt · Accepted Answer

✔ the population

Standard Deviation Answers