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The heights of 6 randomly selected Sailors are in inches: 65, 67, 68, 69, 71 and 72. The heights of 5 randomly selected Soldiers are: 69, 70, 71, 72 and 75. Discuss in the light of these data that sailors are on the average shorter than sailors. Assume that heights are normally distributed with equal but unknown variances. Use α = 5%
How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 pound of the true population mean? Assume that the population standard deviation is known to be 10.6 lb.
It is known that 15% of US home mortgages are under water (i.e. the homeowner owes more than the house is worth). Suppose 18 mortgages are randomly selected (assume independence). Let the random variable X equal the number that are under water.
What is the probability that Ford will sell between 2.4 and 2.7 million cars during the next year?
How does net working capital affect the NPV of a 8-year project if working capital is expected to increase by $14,000 and the project
Executives Whose Wives Stay at Home Earn More" was the headline for an article that appeared in the San Luis Obispo Telegram-Tribune (Oct. 14, 1994).
Keno Keno is a favorite game in casinos, and similar games are popular with the states that operate lotteries. Balls numbered 1 to 80 are tumbled in a machine.
agents at an insurance company office in a small town process an average of fifteen auto insurance claims per week.
What would be the population proportion of number of times that bats would follow the point?
At this point, he would then ask you if you wanted to switch to the other door before revealing what you had won. Is it to your advantage to switch? (Hint: The answer might depend on p.)
which is preferable as a graphical display for a large quantitative data set a histogram or a stem-and-leaf diagram?
Is there any evidence to suggest the variance is greater than the desired value? Assume normality and use a = 0.01. Write a Solution Trail for this problem.
In general, what would be the result if judges instructed juries to never make a Type I error?- never make a Type II error?
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