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Question: Several years ago a new chief executive was appointed to a group of firms. On appointment the CE expressed concern about the quality of the senior management in one of the major companies in the group. He felt that this group of managers was by and large out of touch with new technology, new market opportunities and so on and, in spite of boardroom opposition, the CE has tried over the past few years to encourage a younger age structure among these senior managers via an active promotion and recruitment policy. Data has been provided on the age structure of these senior managers in 1990. The group had a mean age of 53 years. A sample of 20 senior managers this year finds an average age of 46, standard deviation 4.6 years. Can the CE conclude that his policies have had an effect in terms of reducing the mean age of senior managers?
The "average" (mean) tire wore out at 41,000 miles, and the standard deviation was 4000 miles. Approximately what percent of the tires are likely to wear out before 40,200 miles?
Do these data present sufficient evidence to conclude there is a difference in the mean strength of the three types of shocks after 20,000 miles?
Find the expected annual cost associated with managing potential shortages or surpluses of this product. An exact solution using probability arguments.
(a) Determine the corner frequencies (break frequencies) for the Bode plot (b) Determine the slope of the asymptotic plot at very low frequencies and at high frequencies, (c) Sketch the Bode magnitude plot.
What is the probability that (a) all 13 spades end up in the same hand? (b) all four aces end up in the same hand?
Tablet hardness. Exercise 27.11 concerns process control data on the hardness of tablets (measured in kilograms) for a pharmaceutical product. Table 27.4 gives data for 20 new samples of size 4, with the and s for each sample. The process has bee..
Constructing a Pareto chart. Comparisons are easier if you order the bars in a bar graph by height. A bar graph ordered from tallest to shortest bar.
The Better Business Bureau (BBB) wants to determine whether a certain business is engaging in fair hiring practices.
A sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares at $50 per share was $33.77 (AAII Journal, February 2006).
If the half-life of a given substance is 60 days, how long will it take for a 30 gram sample of the substance to decay until there is only 7.5 grams of the radioactive material remaining?
What is the conditional probability that a randomly selected customer would order a biscotti, given that he or she orders coffee?
The t statistic is an inferential statistic used to determine the number of standard deviations in a t distribution that a sample mean deviates from the mean.
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