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A random sample of 21 nickels measured with a very accurate micrometer showed a mean diameter of 0.834343 inches with a standard deviation of 0.001886 inches. (a) Why would nickel diameters vary? (b) Construct a 99 percent confidence interval for the true mean diameter of a nickel. (c) Discuss any assumptions that are needed. (d) What sample size would ensure an error of ± 0.0005 inches with 99 percent confidence?
Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households selected at random, what is the probability that:
The analysis needs to be re-run adding the error into the regression sum of squares.
Compare two month moving average also exponential smoothing using MAD. The subsiquent data represents demand for company ABC's products for the last 10 months.
Create risk profiles for medium and large alternatives. Given mayors concern over possibility of losing money and result of part (a), which alternative would you suggest?
When the purpose of sampling is to detect when a process becomes too variable the chart of choice will be a c-chart?
If he finds differences, then he may realize that, 1) he will need to evaluate his course ethnic sensitivity,
What is a prime number, and why are prime numbers important? What do you call a number that is not prime? What is the largest prime number ever found?
Compute the Pearson correlation. Multiply each X value by 2 and compute the Pearson correlation for the modified scores.
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
Suppose that 64 smokers were sampled. Assume the sample mean and the sample standard deviation remained the same ($20 and $5, respectively).
The mean number of passengers per cruise is 1,820 and the standard deviation is 120.
Four brands of lightbulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
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