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Proctor and Gamble wants to know whether the percentage of American consumers who use dishwasher tablets has increased from its historical level of 33%. Proctor and Gamble surveys a random and representative sample of 1000 American consumers, and asks them whether they use dishwasher tablets. 350 out of 1000 use dishwasher tablets. It it has evidence that the proportion of American consumers who use dishwasher tablets has increased Proctor and Gamble will spend $500,000 expanding production of dishwasher tablets.
-Carry out a hypothesis test to find whether there is evidence that the percentage of American consumers who use dishwasher tablets has increased from its historical level of 33%. Use a significance of 5%.
-Suppose that the percentage of American consumers who use dishwasher tablets is 33%. What proportion of the time would your hypothesis testing procedure report that there is evidence that the percentage of American consumers who use dishwasher tablets has increased from its historical level of 33%?
The national average for the price of a gallon of unleaded regular gas is $1.16. I believe the price is higher in my area of the country. I want to test my claim by randomly selecting gas prices for 25 stations in my area. The following prices are..
An engineer collected data from a random sample of water tank construction projects to build a statistical linear model that not only estimates the unit cost of water tank construction but also investigates the influence of certain factors on the..
This is called a one-time fling. About 10% of all adults deliberately do a opne-time fling and feel no guilt about it!
determine the confidence level for each of the following large-sample one-sided confidence bounds.a upper bound x
Assume that the sample proportion calculated calculated from the above data is the population proportion (assume alpha=0.05).
What is the net present value (NPV) of the project if the company's cost of capital is 12.43 percent?
a national survey of graduate students is conducted to assess thier consumption of coffee. the table below summarizes
An automobile parts supplier manufactures a cylindrical engine part. The part is supposed to have an outside diameter of four centimetres. Parts with diameters that are too large or too small will not fit properly within the engine and must be dis..
Defining a Hypothesis mathematically its a mall survey scenario. is the time spent by customers in the mall the same for the different times of the day.
Obvious tests In many cases, hypothesis testing is used when the evidence is obvious. For example, why would you even bother testing if the true mean is 50 ppm?
An electronic device is made up of two components A and B such that the device would work satisfactorily as long as at least one of the components works.
In a test of a weight loss program, weights of 40 subjects are recorded before and after the program. Assume that the before/after weights result in r = 0.876.
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