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. The average gasoline price of one of the major oil companies has been $1.25 per gallon. Recently the company has under taken several efficiency measures in order to reduce prices. Management is interested in determining whether their efficiency measures has been have actually reduced prices. That is, they are interested in deterring whether or not the current average price is significantly less than $1.25. A random sample of 49of their gas station is selected and the average price is determined to be $1.20. Assume that the population standard deviation (Ó) is $0.14.
(a) At a 95% confidence, test to determine wether the measures were effective in reducing the average prices
(b) Compute the p-value associated with the above sample results, and explain what conclusion can be drawn bases on the p-value?
Suppose you are testing the differences in attitudes toward health care reform using Democrats, Republications, and Independents. What statistical test would you use?
What is the most probable number of patients arriving each Saturday and give the main assumptions we make when we model the above situation using a Poisson distribution.
A sample of 20 cables is selected and tested. Find the sample mean that will cut off the upper 95% of all samples of size 20 taken from the population.
Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households at random, what is the probability that every household has a cellular telephone?
Find the minimum amount of water pumped in 30 days. Let y be the total number of gallons pumped x days after pumping being. Note that (0,0) is on graph of the equation.
The following data represent the number of weed-eaters sold per month at a local garden shop and their prices
The mean and variance of the total amount of money that is collected from a car that crosses the bridge are:
The average family size was reported as 3.18. A random sample of families in a particular school district resulted in the following family sizes: 5 4 5 4 4 3 6 4 3 3 5 6 3 3 2 7 4 5 2 2 2 3 52
We are asked to investigate the hypothesis that the number of crimes is related to police expenditures because states with higher crime rates are likely to increase their police force, thereby spending more on the number of officers on the street.
What is the opportunity loss of spending 4 hours per week on average studying for the exam when the exam turns out to be easy?
Some IQ tests are standardized to normal model with mean of 100 and the standard deviation of 16. Draw a model for these IQ scores, clearly label it , showing what the 65-95-99.7 rule predicts about the score.
Distinct random variable
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