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Question: When one is attempting to determine the required sample size for estimating a population mean, and the information on the population standard deviation is not available, it may be feasible to take a small preliminary sample and use the sample standard deviation to estimate the required sample size, n. Suppose that we want to estimate μ , the mean commuting distance for students at a community college, to within 1 mile with a confidence level of 95%. A random sample of 20 students yields a standard deviation of 4.1 miles. Use this value of the sample standard deviation, s, to estimate the required sample size, n. Assume that the corresponding population has a normal distribution.
If the airlines' goal was to attain the same proportion of on-time arrivals as in 2004, do the preliminary results indicate that they have met this goal? Support your assertions.
The company is contemplat ing the proportion of surveys that customers will ac tually return. It is known from considerable past experience with these types of surveys that the expected proportion of returned surveys is equal to .40, with a var..
diamonds are classified according to carat weight clarity color and cut. the color of a diamond is classified as d e f
suppose the service time in minutes at a bank has the exponential distribution with lambda 12. use the central limit
Find the 5 rectangles with these numbers, using 00 to represent rectangle number 100, and mark them on the sheet. This is your random sample of five rectangles.
life expectancies for men and women were measured by country. it was found that the average male life expectancy was
Passing stats. Molly's college offers two sections of Statistics 101. From what she has heard about the two professors listed, Molly estimates that her chances.
Group the data into class intervals of size 1 percent starting with the value 13.0, and draw the resulting histogram.
birthweights at a local hospital have a normal distribution with a mean of 110 oz. and a standard deviation of 15 oz.
assume that the readings at freezing on a batch of thermometers are normally distributed with mean 0degc and standard
suppose the heights of sons and fathers has a correlation of 0.6 and both sons and fathers have an average height of 68
What is the probability that the contaminated can is selected for testing?
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