# QNT 275 Week 5 Quiz

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QNT 275 Week 5 Quiz

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**QNT 275 Week 5 Quiz**

Chapter 08, Section 8.2, Problem 010

Correct.

Find z for a 90% confidence level.

Round your answer to two decimal places.

z=

the tolerance is +/-2%

Chapter 08, Section 8.2, Problem 011

Your answer is partially correct.

For a data set obtained from a sample, n=80 and x¯=46.55. It is known that σ=3.9.

- What is the point estimate of μ?

The point estimate is .

- Make a 97% confidence interval for μ.

Round your answers to two decimal places.

( , )

- What is the margin of error of estimate for part b?

Round your answer to three decimal places.

E=

Chapter 08, Section 8.2, Problem 017a

Correct.

Determine the sample size for the estimate of μ for the following.

E=2.4, σ=12.35, confidence level=99%.

Round your answer to the nearest integer.

n=

the tolerance is +/-2%

Chapter 08, Section 8.3, Problem 034b

Correct.

For the following, find the area in the appropriate tail of the t distribution.

t=1.711 and n=25.

Round your answer to 3 decimal places.

Area in the

tail is

the tolerance is +/-2%

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