AnswersAZ-Common Core Algebra II BIntroduction to Normal Distributions

Introduction to Normal Distributions Answers

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1
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Which of the following criteria are necessary conditions for making a statistical inference?

A
sample size greater than 30, or an approximately normal data set
B
sample size greater than 100
C
convenience sample
D
simple random sample
E
systematic sample
2
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A confidence level of 95% means:

A
95% of the time, sample percentages will fall above the mean.
B
95% of the time, population data will fall between 149.61 and 150.39.
C
the mean of 95% of the adults in the sample was 150.
3

The confidence interval is [___] to [___].

Answer:

0.27 to 0.39

4

What range of values shows the confidence interval for the study?

A
146.1 to 153.9
B
149.61 to 150.39
C
150 to 150.39
D
150 to 153.9
5

Among 420 randomly selected employees at a company, the mean number of hours of overtime worked per month is 10 hours and the standard deviation is 1.6. What is the margin of error, assuming a 99% confidence level?

A
4.12
B
0.01
C
0.20
D
20.5
6

What is the margin of error, assuming a 90% confidence level? Round your answer to the nearest tenth.

Answer:

2.6

7

The margin of error, assuming a 95% confidence level, is approximately . Round to the nearest hundredth

Answer:

0.04

8

The margin of error for a 95% confidence level will be greater than 0.3.less than 0.3.equal to 0.3.

A
greater than 0.3.
B
less than 0.3.
C
equal to 0.3.
9

The confidence interval is ⇒ 7.33 to ⇒ 7.67.

Answers:
⇒ 7.33:0.27 to 0.39
⇒ 7.67:0.27 to 0.39

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