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In order to determine the summer unemployment rate among college students, a pilot sample was taken; and it was determined that fifteen percent of the individuals in the sample were unemployed. Using the results of the pilot study and a 95% confidence, what size sample would be required to estimate the proportion of unemployed college students if we want the margin of error not to exceed 5 percent?
Suppose that 10% of all adults jog. An opinion poll asks an SRS of 400 adults if they jog. a) What is the sampling distribution of the proportion p^ in the sample who jog?
A random sample of n = 4 scores is obtained from a normal population with m = 20 and σ = 4. What is the probability of obtaining a mean greater than M =22 for this sample?
The National Association of Realtors Existing-Home Sales Series provides a measurement of the residential real estate market. One of the measurements it produces is the Hous
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of h
In a study to determine frequency and dependency of color-blindness relative to females and males, people were chosen at random and the following results were recorded: Fema
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages. (a) At the .01 level of
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