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.The average length of a flight by regional airlines in the United States has been reported s464 miles. If a simple random sample of 30 flights by regional airlines were to have x = 79.6 miles and s = 42.8 miles, would this tend to cast doubt on the reported average of 64 miles? Use a two-tail test and the 0.05 level of significance in arriving at your answer.

.The average length of a flight by regional airlines in the United States has been reported s464 miles. If a simple random sample of 30 flights by regional airlines were to have x = 79.6 miles and s = 42.8 miles, would this tend to cast doubt on the reported average of 64 miles? Use a two-tail test and the 0.05 level of significance in arriving at your answer.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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1.The average length of a flight by regional airlines in the United States has been reported as 464 miles. If a simple random sample of 30 flights by regional airlines were to havex 479.6 miles and s = 42.8 miles, would this tend to cast doubt on the reported average of 464 miles? Use a two-tail test and the 0.05 level of significance in arriving at your answer. 2. A scrap metal dealer claims that the mean of his cash sales is “no more than $80," but an Internal Revenue Service agent believes the dealer is untruthful. Observing a sample of 20 cash customers, the agent finds the mean purchase to be $91, with a standard deviation of $21. Assuming the population is approximately normally distributed, and using the 0.05 level of significance, is the agent's suspicion confirmed? 3. A factory has a machine that dispenses 80ml of fluid in a bottle. An employee believes the average amount of fluid is not 80ml. Using 40 samples, he measures the average amount dispensed by the machine to be 78ml with a standard deviation of 2.5. At a significance level of 95%, is there enough evidence to support the idea that the machine is working properly?
Transcribed Image Text:1.The average length of a flight by regional airlines in the United States has been reported as 464 miles. If a simple random sample of 30 flights by regional airlines were to havex 479.6 miles and s = 42.8 miles, would this tend to cast doubt on the reported average of 464 miles? Use a two-tail test and the 0.05 level of significance in arriving at your answer. 2. A scrap metal dealer claims that the mean of his cash sales is “no more than $80," but an Internal Revenue Service agent believes the dealer is untruthful. Observing a sample of 20 cash customers, the agent finds the mean purchase to be $91, with a standard deviation of $21. Assuming the population is approximately normally distributed, and using the 0.05 level of significance, is the agent's suspicion confirmed? 3. A factory has a machine that dispenses 80ml of fluid in a bottle. An employee believes the average amount of fluid is not 80ml. Using 40 samples, he measures the average amount dispensed by the machine to be 78ml with a standard deviation of 2.5. At a significance level of 95%, is there enough evidence to support the idea that the machine is working properly?
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