One-Way Airfares The average one-way airfare from Pittsburgh to Washington D.C. is $236. A random sample of 20 one-way fares during a particular month had a mean of $222 with a standard deviation of $43. At a=0.05, is there sufficient evidence to conclude a difference from the stated mean? (a) State the hypothesis and identify the claim with the correct hypothesis. (b)Find the critical value(s). Round the answer to decimal places, if necessary. If there is more than one critical value, separate them with commas. (c)Compute the test value. Round score to at least three decimal places. (d)Make the decision. (e)Summarize the results. (f)Use the sample statistics to construct a 98% confidence interval for the true mean one-way airfare from Pittsburgh to Washington, D.C. Round your answers to two decimal places. (g)Do they support or contradict one another?
One-Way Airfares The average one-way airfare from Pittsburgh to Washington D.C. is $236. A random sample of 20 one-way fares during a particular month had a mean of $222 with a standard deviation of $43. At a=0.05, is there sufficient evidence to conclude a difference from the stated mean?
(a) State the hypothesis and identify the claim with the correct hypothesis.
(b)Find the critical value(s). Round the answer to decimal places, if necessary. If there is more than one critical value, separate them with commas.
(c)Compute the test value. Round score to at least three decimal places.
(d)Make the decision.
(e)Summarize the results.
(f)Use the sample statistics to construct a 98% confidence interval for the true mean one-way airfare from Pittsburgh to Washington, D.C. Round your answers to two decimal places.
(g)Do they support or contradict one another?
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