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According to a study, several years ago by the Emerson Communications Industry Association, the average wireless phone user earns $ 62,600 per year. Suppose a researcher believes that the average annual earnings of a wireless phone user are lower now, and sets up a study in an attempt to prove his theory. He randomly selects 38 wireless phone users and finds out that the average annual salary for this sample is $58794, with a population standard deviation of $7810. Use α = 0.01 to test the researcher's theory. Assume wages in this industry are normally distributed, determine the 99% confidence interval of the population mean.
A recent study of the USA births showed the average birth weight of a male was 8 lbs.; the average weight of a female newborn was 7.4 lbs.
City government has collected the following data on annual sales tax collections and new car registrations: Determine the least squares regression equation.
Construct a 95% confidence interval for the proportion of adults from the West who say traffic congestion is a serious problem.
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
Suppose that you select a sample of 100 U.S. hospital patients. The probability is 90% that the sample percentage will be within what symmetrical limits of the population?
In a sample of 210 men, 35 prefer sugar free soft drinks. In a sample of 220 women, 42 prefer sugar free soft drinks. Using a significance level of 0.05, test whether women prefer sugar free drinks more than men. Calculate the p-value.
The American Bankers Association collects data on the use of credit cards, debit cards, personal checks, and cash when consumers pay for in-store purchases (The Wall Street Journal, December 16, 2003). In 1999, the following usages were reported.
A grab bag comprises 11 $1 prizes, 7 $5 prizes, and 2 $20 prizes. Three prizes are selected at random. Determine the probability which exactly two $20 prizes are chosen?
A random sample of 16 students selected from the student body of a large university had an average age of 25 years and a standard deviation of 2 years.
What proportion of 330 cci cars fall between 26 to 30 miles per gallon range? Compute the percentage of each of the car models that get 30 or more mpg.
What are the requirements for applying the hypothesis test for the difference in two population proportions? What are the calculations (computations)?
Individual loss amounts (ground up) this year follow an inverse Weibull distribution with τ= 3 and expected value 1000. Next year you con?fidently expect loss amounts to in?ate by 10% uniformly across the board.
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