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During a national debate on changes to health care, a cable news service performs an opinion poll of 500 small-business owners. It shows that 47 percent of small-business owners do not approve of the changes.
Develop a 95 percent confidence interval for the proportion opposing health care changes. (Round your answers to 4 decimal places.)
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of signi?cance.
A car manufacturer has redesigned the anti-theft device on one of its models to increase the time that it takes for a professional car thief to be able to steal the car.
in a town 60 of families are known to drive european cars. in a sample of 10 families what is the probability that at
an article in the american statistician m. l. r. ernst et al. scatterplots for unordered pairs 50 1996 pp. 260-265
The national average SAT score (for Verbal and Math) is 1028. Suppose that nothing is known about the shape of the distribution and that the standard deviation is 100. If a random sample of 200 scores were selected and the sample mean were calcula..
Compute mean, standard deviation, coefficient of variation and 5 key percentiles for these data.
you are dealt two cards successively without replacement from a standard deck of 52 playing cards. find the
find the z-score for the standard normal distribution wherepzlta
Find the mean, median, mode, variance, standard deviation, frequency table, cumulative frequency table, coefficient of variation, and mean deviation of the population.
Compute expected value for each of three actions and find out if manager must accept, further analyze, or reject the lot? Determine expected value of perfect information (EVPI)?
A candy confectioner measures the weight of 30 pieces of candy and obtains a mean and standard deviation of 32.5 gms and 2.6 gms, respectively. Construct the 98% confidence interval for the population mean.
1- as the confidence level increases while me stays the same does the required sample size increase decrease or stays
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