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You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery in an effort to reduce the mean time between the order and completion of delivery from the current 25 minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.4 minutes and a sample standard deviation of 6 minutes.
a. Using the six-step critical value approach, at the 0.05 level of significance, is there evidence that the population mean delivery time has been reduced below the previous population mean value of 25 minutes?b. At the 0.05 level of significance, use the five-step p-value approach.c. Interpret the meaning of the p-value in (b)d. Compare your conclusions in (a) and (b)
If your ANOVA shows no interaction between two factors: A) You must re-run the ANOVA in minitab without replicates. B) Start over taking more samples, the current results aren't valid without showing an interaction.
In random samples of 12 from each of two normal populations, we found the following statistics: Describe what happens when the sample standard deviations get larger.
The DPMO for process is 860. Find the approximate Six Sigma level of the process?
Let Y be the number of envelopes for which the machine fails to remove a check. Using the Central Limit Theorem to approximate P{Y≤10}.
Prepare an ANOVA table and test the null hypothesis of no linear relationship between the two variables.
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
A new speed limit will be initiated such that approximately 10% of vehicles will be over the speed limit. What is the new speed limit based on this criterion? In what way do you think the actual distribution of speeds differs from a normal distribu..
2 to every even-numbered card, with aces being 1s. Determine the frequencies of 0, 1, and 2. Use SPSS to get the value of test statistic and p-value.
According to an Internet posting, 80% of adults enjoy drinking beer. If a group of 3 adults is selected at random, find the probability that none of them enjoy drinking beer.
Assume that the distribution of heights of adults American normally distributed, with mean 69 inches and standard deviation 2.8 inches.
According to an article, 19% of the entire US population have high-speed access to the Internet. Random samples of size 200 are selected from the US population.
Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
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