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Elearning 2/17- Confidence Interval Practice

Authored by Kyle Anderson

Mathematics

10th Grade - University

Used 1+ times

Elearning 2/17- Confidence Interval Practice
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10 questions

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1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A sample size of n = 64 is drawn from a population whose standard deviation is σ = 5.6.


Find the margin of error for a 99% confidence interval for µ.

1.799

1.798

1.803

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

A large sample has mean of 7.1 and Standard Error of 2.3.


Construct a 90% Confidence Interval for the population mean µ (to two decimal places).

(3.32, 10.88)

(3.8, 7.1)

(3.3, 10.9)

(3.3165, 10.8835)

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10. It is desired to construct a 90% confidence interval for the mean IQ scores of the students at the college.


What is the point estimate?

75

105.2

10

0.90

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10. It is desired to construct a 90% confidence interval for the mean IQ scores of the students at the college.


Find the critical value.

0.90

1.155

1.645

±1.645

5.

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

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the degrees of freedom equal to?

n
n+1
1-n
n-1

7.

MULTIPLE CHOICE QUESTION

10 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)

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