# QNT 275 Week 4 Practice Set

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QNT 275 Week 4 Practice Set

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# QNT 275 Week 4 Practice Set

**Complete **the Week 4 Practice Set problems.

**Click** the Assignment Files tab to submit your assignment.

Practice Set 4

# Practice Set 4

- Find z for each of the following confidence levels. Round to two decimal places.

- 90%

- 95%

- 96%

- 97%

- 98%

- 99%

- For a data set obtained from a random sample, n = 81 and x = 48.25. It is known

that σ = 4.8.

- What is the point estimate of μ? Round to two decimal places

- Make a 95% confidence interval for μ. What is the lower limit? Round to two decimal places.

- Make a 95% confidence interval for μ. What is the upper limit? Round to two decimal places.

- What is the margin of error of estimate for part b? Round to two decimal places.

- Determine the sample size (nfor the estimate of μ for the following.

- E = 2.3, σ = 15.40, confidence level = 99%. Round to the nearest whole number.

- E = 4.1, σ = 23.45, confidence level = 95%. Round to the nearest whole number.

- E = 25.9, σ = 122.25, confidence level = 90%. Round to the nearest whole number.

- True or False.

a.The null hypothesis is a claim about a population parameter that is assumed to be false until it is declared false.

- True

- False

- An alternative hypothesis is a claim about a population parameter that will be true if the null hypothesis is false.

- True

- False

- The critical point(s) divide(s) is some of the area under a distribution curve into rejection and nonrejection regions.

- True

- False

- The significance level, denoted by α, is the probability of making a Type II error, that is, the probability of rejecting the null hypothesis when it is actually true.

- True

- False

- The nonrejection region is the area to the right or left of the critical point where the null hypothesis is not rejected.

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