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Thirty-five percent of adult americans are regular voters. A random sample of 250 adults in a medium size college town were surveyed and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence.
Find the value of Z-score- standard normal distribution.Find out a value of the standard normal random variable z, call it z0.
Find the probability that their mean energy consumption level for September is greater than 1075 kWh.
Determine the class with the greatest number of data values.
A real estate agent wants to compare the variation in the selling price of homes on the oceanfront with those 3 blocks away A sample of 21 oceanfront homes sold within the last year revealed the standard deviation of the selling prices was 45,600.
Washing machines leaving the factory that are defective. Obtain a sample size that will ensure a margin of error of at most 0.014 for a 97% confidence interval.
What is the probability that of today's 1,000 callers at least 5 received a busy signal? Use the poisson approximation to the binomial. (Round your answer to 4 decimal places.)
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Determine the highest number of miles (to nearest whole number) that motorist could drive in month and still qualify for discount?
Researchers are studying the absorption of two drugs into the bloodstream. Each drug is to be injected at three dosages. There are 24 people in the study, and they are randomly divided into six groups.
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
ABC Corporation has been using statistical process control for several months.
In a certain distribution of numbers the mean is 60 with a standard deviation of 8. Use Chebyshevs theorum to tell the probability that a number lies in each interval.
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