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A tire manufacturer wants to estimate the average number of miles that may be driven on a tire of a certain type before the tire wears out.
Digital media have recently begun to take over from print outlets.7 A newspaper owners’ association wants to estimate the average number of times.
Pier 1 Imports is a nationwide retail outlet selling imported furniture and other home items. From time to time, the company surveys its regular customers.
The random sample of the wealth, in billions of U.S. dollars, of individuals listed on the Forbes “Billionaires” list for 2007.
To aid in planning the development of a tourist shopping area, a state agency wants to estimate the average dollar amount spent by a tourist in an existing shop
If a random sample of 200 women is selected, what is the probability that the sample mean will fall between 1.52 and 1.62?
Suppose that you are given a new sample statistic to serve as an estimator of some population parameter.
The daily number of visitors to a Web site follows a normal distribution with mean 15,830 and standard deviation 458.
A new kind of alkaline battery is believed to last an average of 25 hours of continuous use (in a given kind of flashlight).
Acompany supplies pins in bulk to a customer. The company uses an automatic lathe to produce the pins.
A car manufacturer wants to estimate the average miles-per-gallon highway rating for a new model.
To estimate the proportion of errors made in a day, a random sample of 400 transactions on a particular day was checked.
According to BusinessWeek, profits in the energy sector have been rising, with one company averaging $3.42 monthly per share.
A real estate agent needs to estimate the average value of a residential property of a given size in a certain area.
Häagen-Dazs ice cream produces a frozen yogurt aimed at health-conscious ice cream lovers.
A random sample of 40 cars is taken and each sampled car is tested for its fuel efficiency. Assuming that 52 miles per gallon is the population mean.
Recently, the federal government claimed that the state of Alaska had overpaid 20% of the Medicare recipients in the state.
Searches at Switzerland’s 406 commercial banks turned up only $3.3 million in accounts belonging to Zaire’s deposed president, Mobutu Sese Seko.
The proportion of defective microcomputer disks of a certain kind is believed to be anywhere from 0.06 to 0.10.
Is the sample median a biased estimator of the population mean? Why do we usually prefer the sample mean to the sample median as an estimator.
Residential real estate in New York rents for an average of $44 per square foot, for a certain segment of the market.
According to Money, the average U.S. government bond fund earned 3.9% over the 12 months ending in February 2007.
If a random sample of 100 shoppers is taken, what is the probability that at least 30 of them will be found to be holders of the card?
Three independent random samples are collected, and three sample means are computed. The total size of the combined sample is 124.
Suppose that you have an estimator with a relatively large bias. The estimator is consistent and efficient, however.