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We know many types of data fall into a normal distribution with most of the observations falling towards the middle. However sometimes data ar eoutliers or data that are very differnet from the rest
A new integrated computer system is to be installed worldwide for a major corporation. Bids on this project are being solictied, and the contract will be awarded to one of the bidders. As a part of
A random sample of 175 students from a large suburban high school showed that 80 of them participate in team sports run by such organizations. Use a .05 significance level to test a claim that more
A recent political poll for a local election indicated that 70% of the 250 voters sampled preferred Candidate A. Candidate B is surprised by this survey because he thought that the race was a dead h
What pattern would appear in a graph of a Pearson correlation of r = -0.80?
Consider taking samples of size 25 from a population with proportion 0.65. Find the mean of the distribution of sample proportions
Make a control chart to determine what signals, if any, indicate that the process is out of control. Then list the days the signal occurredand the type of signal (I,II,III)
The hard drive reader head is the only likely component to fail, and all that fail are replaced. These have a life expectancy that follows the normal distribution with mean 60 months and standard de
The department of natural resources reports that a fish is unsafe to eat if the polychlorinated biphenol (PCB) concentratio exceeds 5 parts per billion (ppb). A sample of 10 fish taken from a local
It is thought that prehistoric Indians did not take their best tools, pottery, and household items when they visited higher elevations for their summer camps.
From experience a high-jumper knows that he can clear a height of at least 1.78 meters once in 5 attempts. He also knows that he can clear a height of at least 1.65 meters on 7 out of 10 attempts.
A car manufacturer claims that the miles per gallon for a certain model has a mean equal to 40.5 miles with a standard deviation equal to 3.5 miles. Use the following data, obtained from a random sa
A soft drink dispenser is set to automatically dispense drinks and ice in 8 oz. cups. The machine is set to fill the cups with 7 1/4 oz. so that the liquid will not run over the top of the cup.
In a random sample of 40 felons convicted of aggarvated assault, it was determined that the mean length of sentencing was 54 months, with a standard deviation of 8 months. Construct and interpret a
Professor takes a random sample of students enrolled in Statistics 101 at ABC University. He finds the following: there are 25 freshman in the sample, 32 sophomores, 18 juniors, and 20 seniors. He w
A USA Today/Gallup Poll asked 1006 adult Americans how much it would bother them to stay in a room on the 13th floor of a hotel. Interestingly, 13% said it would bother them. The margin of error was
The inside diameter of a randomly selected piston ring is a random variable with mean value 12 cm and standard deviation 0.4 cm. Let X is the sarnple mean diameter for a random sample of n:64 rings.
A polling organization will take a random sample of 250 voters and will use , the sample proportion, to estimate p. What is the approximate probability that will be greater than .5, causing the poll
What is the maximum allowable value of ? that will permit no more than 1 in 100 defectives when the widths are normally distributed with µ = 0.9000 and ? (revised value)?
The speeds of car traveling on Interstate Highway I-35 are normally distributed with a mean of 74 miles per hour and a standard deviation of 6 miles per hour.
Expected return for the corporate bond fund and for the common stock fund. Standard deviation for the corporate bond fund and for the common stock fund.
Errors in a billing process often lead to customer dissatisfaction and ultimately hurt bottom-line profits. An article in Quality Progress
An industrial sewing machine uses ball bearings that are targeted to have a diameter of 0.75 inch. The lower and upper specification limits under which the ball bearings can operate are 0.74 inch an