Stats Help for College-level Students

Probability and binomial distributions 20 point value

Acme plumbing supply just received a shipment of 5,000 stainless steel valves, but 50 regular steel valves were also sent. There is no way to tell the difference between the valves. A customer orders 5 stainless steel valves . What is the probability that one or more will be regular steel? What distribution will be used? What ar ...continues

Hypotheses Testing

A MANUFACTURER OF COMPUTER CHIPS CLAIMS THAT MORE THAN 90% OF HIS PRODUCTS CONFORM TO SPECIFICATIONS. IN A RANDOM SAMPLE OF 1000 CHIPS DRAWN FROM A LARGE PRODUCTION RUN, 875 WERE ACCEPTABLE. DO THE DATA PROVIDE SUFFICIENT EVIDENCE AT THE 1% LEVEL OF SIGNIFICANCE TO CONCLUDE THE MANUFACTURER'S CLAIM IS FALSE? a. State the Null ...continues

Confidence Interval

Using sample results and level of confidence of 0.01, test to determine whether the figure published by Runzheimer International is too high. Was it a one- or two-tailed test?

Confidence Intervals

Use these data and hypothesis-testing techniques along with a 5% level of significance to determine whether the mean hourly wage of a manufacturing worker has changed.

Normal Distribution. Suppose that the height of a man is normally distributed with a mean of 5'9" (69") and a standard deviation of 2". Find the minimum height of the ceiling of an airplane, such that at most 2% of the men walking down the aisle will have to duck their heads?

Suppose that the height of a man is normally distributed with a mean of 5'9" (69") and a standard deviation of 2". Find the minimum height of the ceiling of an airplane, such that at most 2% of the men walking down the aisle will have to duck their heads? A. Define the random variable? B. List the parameters for the distribut ...continues

Calculating the binomial probability question using a normal standard distribution table.

Acme Plumbing Supply has just received a shipment of 5,000 valves for chemical plants, where regular steel valves would corrode. However, it is known that in the shipment 50 of the valves are regular steel which were inadvertently included. Unfortunately there was no was to distinguish between the two types of valves. They ...continues

test hypotheses

PERSISTANT LOW HEMOCRIT IN ALL THE ELDERLY PATIENTS IN A NURSING HOME F .31, WITH A NORMAL OF .41. AN INTERVENTION PROGRAM OF AN IRON SUPPLEMENT WAS INITIATED TO SEE IF THE HEMOCRIT WOULD INCREASE. A RANDOM SAMPLE OF 100 PATIENTS SHOWED THAT 60 PATIENTS NOW HAD ELEVATED LEVELS OF HEMOCRIT OF .41. CAN WE CONCLUDE AT ALPHA= 0.0 ...continues

graph, stem and leaf, range and mode

AS A RESULT OF A PROLONGED ECONOMIC BOOM, TORONTO IS UNDERGOING SEVERAL CHANGES THAT ARE STARTING TO CAUSE SOCIAL AND ECONOMIC PROBLEMS. ONE SERIOUS PROBLEM IS THE LACK OF AFFORDABLE HOUSING FOR YOUNG PEOPLE. THE HOUSING PRICES OVER A 12-MONTH PERIOD ARE SHOWN BELOW. JAN $195,000 JUL $205,000 FEB 196, ...continues

Confidence Interval

1) a statistian claims that the average score on a test of students for students who major in psychology is greater than that of students who major in math results given to 50 students in each group are shown here Is there enough evidence to support the statisticians claim at @=0.01 Show work. Physc Math X1=118 ...continues

Testing a hypothesis.

The normal serum hemocrit level is 0.41 milligrams to 100 milligrams of blood. The level in elderly patients is significantly low at 0.31. 25 patients out of 100 are normal levels. The standard deviation is 0.6. A medication that is designed to increase the hemocrit is taken in 100 patients for one month. A testing is foun ...continues