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Let's say there is a local company (rhymes with "Zaplan") that promises a score of 625-good enough for admission to your favorite graduate school
Margaret Morris just correctly computed a standard deviation of 6.0 from a sample of 50 observations. What is the variance of Margaret's sample?
Define (a) point estimate, (b) interval estimate, (c) confidence interval, and (d) confidence level.
A lightbulb manufacturer wants to estimate the total number of defective bulbs contained in all of the boxes shipped by the company during the past week
A container of car antifreeze is supposed to hold 3785mL of the liquid. Realizing that fluctuations are inevitable, the quality-control manager
A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years
A sociologist is studying the prevalence of crime in one major city. In a sample of 225 randomly selected residents, 60 say that they have been victimized
A corporation that maintains a large fleet of company cars for the use of its sales staff is interested in the mean distance driven monthly per sales person
Construct a 95 percent confidence interval for the true mean.
A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25.
The security department of a university is planning its budget for the next year. in estimating the man-hours for security during university sponsored
From a production line A, a sample of 200 items is selected at random; and it is determined that 16 items are defective.
The association of coffee growers in Puerto Rico wants to know the average pounds of coffee consumption per week in towns in the metropolitan area
You are an associate assigned to the claims department of a major insurance company. A policy holder has had an accident with his classic 1968 Oldsmobile
Actuaries use various parameters when evaluating the cost of a life insurance policy. The variance of the life spans of a population is one of the parameters
A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55
The statistical process control process is feeding a dog. This is a process I do but must spend less time doing based on Statistical Control is a method
In an effort to estimate the annual income for new graduates, data were collected from 500 new graduates over a one -year period
An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 40 hours.
From the Data Set below select a sample of 20 values and find the 90% confidence interval of the mean of the number of the acres. Find the mean of all values
Would it be reasonable to conclude that more than 10 percent of the applicants are now failing the test?
In an effort to estimate the mean amount spent per household per month in a small Canadian town, data were collected for a sample of 50 households
Compute the 90% confidence interval for the mean amount of damage. Interpret this interval.
Based on a simple random sample of one hundred an analyst estimates the average hourly wage earned by workers in a city to be $30