Confidence Interval T Distribution

Confidence Interval T Distribution

University

15 Qs

quiz-placeholder

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Confidence Interval T Distribution

Confidence Interval T Distribution

Assessment

Quiz

Mathematics

University

Hard

Created by

Lisa Lee

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15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the point estimate associated with the interval (16.5, 27.6

21.05

21.95

22.05

22.95

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the degrees of freedom equal to?

n
n+1
1-n
n-1

3.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A local bank needs information concerning the savings account balances of its customers. A random sample of 13 accounts was checked. The mean balance was $686.75 with a sample standard deviation of $256.20. Find a 95% confidence interval for the true mean.

($513.14, $860.36)
($525.59, $847.91) 
($533.27, $840.23)
($531.92, $841.58)

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Which of the following does NOT have an affect on the width of a confidence interval?

Sample mean
t*
Sample standard deviation
Sample size

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

The 90% interval for a statistics test was given by 72 +- 7. What is the lower bound for the interval?

7
72
65
79

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

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

increasing the confidence level, increasing the sample size
decreasing the confidence level, decreasing the sample size
increasing the confidence level, decreasing the sample size
decreasing the confidence level, increasing the sample size.

7.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A 90% confidence interval for the mean speed driven by cars on East Main St. is given by (21, 45). What was the sample mean of this study?

12
24
33
None of these.

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