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An industrial psychologist consulting with a chain of music stores knows that the average number of complaints management receives each month throughout the industry is 4, but the population standard deviation is unknown. Nine of the chain's stores were randomly selected to record complaints for one month; the sample mean is 3 complaints, with standard deviation of 1.87. Using 0.05 level of significance (p < 0.05), is the number of complaints received by the chain different from the number of complaints received by music stores in general?
a. State the research/alternate hypothesis and the null hypothesis.
b. Identify the characteristics of the comparison (HO) distribution; specifically, its standard deviation and the quantities used to derive these characteristics.
c. Determine correct distribution, then use level of significance to determine either α or cutoff score(s).
d. Determine either the p-value or the sample statistic.
e. Determine whether to reject/fail to reject the null hypothesis, AND state the result of the test (either research hypothesis supported, or study is inconclusive).
Someone tells you that 50% of the tickets in the box show positive numbers. Do you believe it? Answer yes or no, and explain.
Of the 235 airports available for public use in Michigan, 128 are paved and lighted. For a simple random sample of n = 50, what is the probability that at least 20 of the airports in the sample will be paved and lighted?
Suppose X‾t = 5.1 with sw = 7 based on n = 25. Test the hypothesis that the population trimmed mean is exactly 4.8 with α = .01.
a manufacturer has designed a process to produce pipes that are 10 feet long. the distribution of the pipe length
Many companies use sampling to determine whether a batch should be accepted. A (n, c) sampling plan consists of inspecting n randomly selected items from a batch and accepting the batch if c or fewer sampled items are defective.
an advocacy group is investigating whether gender has an effect on job category in large investment firms. given the
During the war with Iraq in 1991 the Terraco Motor Company produced a lightweight, all terrain vehicle code named "J99 Terra" for the military. The company is now planning to sell the Terra to the public.
Brooks Insurance Inc. wishes to offer life insurance to men age 60 via the Internet. What is the probability all five men survive the year? What is the probability at least one does not survive?
the height of a building is measured 32 times. the average of the measurements is 206 feet with standard deviation1.8
At the 0.05 level of significance, is there evidence that the mean amount in the bottles is different from 2.0 liters? Compute the ¬p-value and interpret its meaning.
What is the difference between primary data and secondary data? Between internal secondary data and external secondary data?
In a recent funding drive in support of classical radio, it was announced that 11.35% of the listeners actually donated to the radio station. A survey of 225 listeners found that 10.75% of the listeners had actually donated.
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