# QNT 275 Week 4 Practice Set

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QNT 275 Week 4 Practice Set

https://zh.scribd.com/document/343514565/Uop-Tutorial

# 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

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

1. 90%

1. 95%

1. 96%

1. 97%

1. 98%

1. 99%

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

that σ = 4.8.

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

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

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

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

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

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

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

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

1. 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.

1. True

1. False

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

1. True

1. False

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

1. True

1. False

1. 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.

1. True

1. False

1. 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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