6.2 Confidence Intervals

6.2 Confidence Intervals

12th Grade

20 Qs

quiz-placeholder

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6.2 Confidence Intervals

6.2 Confidence Intervals

Assessment

Quiz

Other

12th Grade

Practice Problem

Hard

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20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which z-value is used for a 95% confidence interval?

1.65
1.96
2.58
2.33

2.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

We plan to survey college seniors to see what proportion plan to attend grad school next year. Using 98% confidence, how many students should we survey if we wish the margin of error to be within 3%?

approximately 1170

approximately 1050

approximately 1500

approximately 40

3.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the t value associated with 90% confidence and a sample size of 15?

1.341
1.345
1.761
1.753

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Margin of Error is equal to:

Standard Deviation

2 * Standard Deviation

Critical Value

Point Estimate

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

True or False: The more confident you want to be, the smaller your confidence interval will be.

True

False

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which of the following changes to a study would result in a smaller confidence interval?

increasing the confidence level, increasing the sample size

increasing the confidence level, decreasing the sample size

decreasing the confidence level, decreasing the sample size

decreasing the confidence level, increasing the sample size.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When the standard deviation is estimated from data, the result is called the ... of the statistic. 

standard error
confidence interval
sample mean
population mean

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