Estimating Mean and Standard Deviation

For a population of five university students with GPAs of 2.5, 2.3, 1.7, 1.4, and 1.1, find the population standard deviation.

• 0.53

• 0.41

• 0.35

• 0.22

The height of three basketball players is 210 cm, 220 cm and 191 cm.
What is their average height?

• 210

• 207

• 220

• 200

Find the mean of these numbers:
2, 57, 38, 42, 6

• 29

• 38

• 50

• 145

Which of the following is a measure of variability?

• mean

• median

• mode

• standard deviation

Find the mean of these numbers:
5,11,2,12,4,2

• 4.1

• 6

• 4.5

• 4

What is the mean?

• happening the most

• the number in the middle

• biggest-smallest

• the average

the square of this value will give the variance

• standard deviation

• variance

• mean

• median

Find the mean giraffe heights.

• 15

• 15.5

• 15.7

• 28.2

Using the data below, find the mean and standard deviation (standard error) for the sample means. (1, 19, 21,10, 5, 6)

• Mean: 10.3, SD: 8.04

• Mean: 10.3, SD: 3.28

• Mean: 10.3, SD: 7.34

• Mean: 10.3, SD: 3.00

A random Sample of 32 gas grills has a mean price of $630.90 and a standard deviation of $56.70. Construct a 95% confidence interval for the sample means.

• (605.18, 670.43)

• (630.81, 660.74)

• (625.91, 645.79)

• (611.26, 650.54)