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The average length of time customers spent on waiting at xyz store's check-out counter before a new P.O.S. system was installed was 5.1 minutes. A sample of 49 customers randomly selected at the check-out counter after the new P.O.S. system was installed showed that the average waiting time was 4.55 minutes with a sample standard deviation of 1.45 minutes. We wish to determine if there has been a significant decrease (from 5.1 minutes) in the average waiting time after the P.O.S. system was installed
1. State the null and alternative hypotheses to be tested.
2. Compute the test statistic.
3. Determine the critical value for this test at the 0.05 level of significance.
4. What do you conclude at the 0.05 level of significance?
5. Construct a 95% confidence interval for the average waiting time after the new P.O.S. system was installed.
Suppose we have a population that does not follow the normal distribution. If we select sample of what size will the distribution approximate the normal distribution?
Is there sufficient evidence to conclude respondents' opinions about the US government are not what would would observe by random chance?
Internet sites often vanish or move, so that references to them can't be followed. In fact, 13% of Internet sites referenced in papers in major scienti?c journals are lost within two years after publication.
use the one-proportion z-interval procedure to find the required confidence interval. be sure to check the conditions
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Use the mixed congruential method to generate the following sequences of random numbers.
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A market research company surveyed consumers to determine their ranked preferences of energy drinks among the brands Monster, Red Bull, and Rockstar.
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An aptitude test is designed to measure leadership abilities of the test subjects. Suppose that the scores on the test are normally distributed with a mean of 580 and a standard deviation of 125.
Suppose a certain brand of Westinghouse light bulbs has a population life expectancy of 3000 and a population standard deviation equal to 100. (Assume the distribution of the population is normal). What is the probability that a sample of 30 light..
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