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A psychologist interested in political behavior measured the square footage of the desks in the official office of four U.S. governors and of four chief executive officers (CEOs) of major U.S. corporations. The figures for the governors were 44, 36, 52, and 40 square feet. The figures for the CEOs were 32, 60, 48, and 36 square feet. (a) Figure the means and standard deviations for the governors and for the CEOs. (b) Explain, to a person who has never had a course in statistics, what you have done. (c) Note the ways in which the means and standard deviations differ, and speculate on the possible meaning of these differences, presuming that they are representative of U.S. governors and large corporations' CEOs in general.
Customers arrive to the company at a rate, on average, of one per hour with a Poisson distribution. The company is staffed by a single individual(the owner) who takes on average 30 minutes with each customer with a standard deviation of 15 minute..
Choose a variable (such as number of daily admissions at a local theater or number of miles students have to commute daily to get to their college.) Before collecting the data, decide what a likely average might be, then complete the following:
If it takes a colony of termites one day to devour a block of wood that is 2 inches wide, 2 inches long, and 2 inches high, then how long will it take them to devour a block of wood that is 4 inches wide,
A random sample of 43 light bulbs has a mean life of 677 hours with a standard deviation of 90 hours. Do you have enough evidence to reject the manufacturer's claim?
Botanist is testing three plants and finds that prob of plant A being alive in a weak is 0.3 plant B is 0.6 and plant C 0.5 these probability are indipendant of each other. Determine the probability of all plants being alive after a weak.
Based on this information, what is the upper limit for the 95 percent confidence interval estimate for the proportion of people in Chicago that listen to WJKT-1450?
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
Graph a relative frequency histogram for the 500 measurements summarized in the accompanying relative frequency table.
The weights of dormitory cockroaches follow a normal distribution. 14% of the dormitory cockroaches weigh below 77 grams and 10% of them weigh above 82 grams. Find the mean and standard deviation of their weights.
Auditor wants to be within 7% of true proportion when using 95% confidence level. How many files should auditor sample?
Complementation to describe each of the following events in terms of A1, A2, and A3, draw a Venn diagram, and shade the region.
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