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According to Road & Track Magazine, the average price for a four-door American-made sedan is $29,445 with a standard deviation of $5,400. A car shopper believes the average price may be different than that and samples 100 cars to test her theory. The sample result shows average price to be $30,700. Develop a critical value test that uses ninety-nine percent confidence to mathematically test this hypothesis. Is the shopper right?
In a recent survey, a company claimed that no more than 40% of all citizens believed the country was in a recession. In a random sample of 375 citizens, 175 stated they believed the country was in a recession. Use a .02 level of significance and test the company's claim based on the critical value.
If the least squares equation for sales data going from 1984 to 1990 is Y1 = 10 + 1.3X (in $ millions) found using the coded method, what is the plot on the straight line for 1988? (x and y values)
if a correlation coeficiant calculated for n14 and a0.01 is found to be r.0856 what is the test value for the
Construction of confidence interval for difference between first and second sample mean revealed interval to be 10 plus or minus 12. We conclude.
Suppose we want to test the hypothesis that a given population distribu- tion is exponential with mean 100; that is, F(x) = 1 - e-x/100.
The standard deviation of a certain dimension on an aircraft part is .005 cm. What CUSUM procedure will give an in-control ARL of 600 and an out-of-control ARL of 4 when the mean value of the dimension shifts by .004 cm?
In a survey about soft drinks it was found that 5% of the respondents like diet soft drinks. 12% of them liked the brand Coke. Of all the Diet soda drinkers 40% liked Coke.
At a particular location on a river the number of fish caught per man-hour of fishing effort has a Poisson distribution with ?= 1.3 fish per man hour. Find the following probabilities:
State the null and alternative hypotheses in terms of the population proportion of households that have at least one telescope.
A child psychologist treated four children who were afraid of snakes with a behavioral modification procedure called systematic desensitization.
1) There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. a) Determine the standard error of the proportion.
More survey questions. Examine each of the following questions for possible bias. If you think the question is biased, indicate how and propose a better.
Based on this information, calculate the interest charged by each card for this purchase and which card is the better deal and by how much
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