Lab040708A

# Lab040708A - Case I The Western Europa Airline claims that...

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Case I. The Western Europa Airline claims that the travel time from Durblin, Ireland to Madrid, Spain with a mean of 220 minutes and a standard deviation of 10 minutes. Newly appointed complia 40 travels that the mean travel time was 216 minutes. At the 5% significance level, is the com 1. State the hypotheses. Specifically, what is the null hypothesis and what is the alternative h H_0: mu=220 (i.e. the travel time is 220 min.) This is two-tailed test. 2. Which test statistic are you going to use? In other words, identify the distribution of the tes Standard Normal, Z-score, since the population standard deviation is known. 3. Calculate the critical values. -1.96 4. State your decision rule. Reject the null, if |z_obs|>|CV|; otherwise, fail to reject the null. 5. Compute the test statistic. z_obs=(X_bar-mu)/std.error=(216-220)/(10/sqrt(40))= -2.53 6. Applying the decision rule, what can you conclude? Since the absolute value of z_obs, which is 2.5298, greater than the absolute value of CV, which is 1 is 220 minutes at 5% significance level. 7. What is the P-value ?

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Lab040708A - Case I The Western Europa Airline claims that...

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