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1. The mean number of travel days per year for salespeople employed by hardware distributors needs to be estimated with a 0.90 degree of confidence. For small pilot study the mean was 150 days and the standard deviation was 14 days. If the population mean is estimated within two days, how many salespeople should be sampled?
2. The proportion of junior executives leaving large manufacturing companies within three years is to be estimated within 3 percent. The 0.95 degree of confidence is to be used. A study conducted several years ago revealed that the percent of junior executives leaving within three years was 21. To update this study, the files of how many junior executives should be studied?
Compute the probability of seven consecutive points falling above the centerline given a stable process. Is this probability associated with type I or type II error?
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 5 percent of the products to weight more than 5.10 ounces.
Determine the best replacement policy over the next five years?
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
At the .01 level of signiicance, is the true mean greater than 10?
Draw a tree diagram representing this experiment. Use this tree diagram to find the probabilities below.
Find out the probability that: (a) The amount requested is between $65,000 or more?
Four properties are randomly selected from each neighborhood and the ratios recorded for each as follows:
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
Utilizing jacobian method finding the probability density function. Utilizing either the CDF method or Jacobian method illustrate the probability density function of Y is given.
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