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A utility requires service operators to answer telephone calls from customers in an average of 0.1 minutes or less, and either respond to them or refer the customer to the proper department within 0.5 minute. The manager is interested in estimating the actual overall time for both components, in total. A pilot study of 30 actual operator times was drawn, and the results are given in the following table. If the service manager wants to 95% confident that the overall time is correctly estimated, with a 3 percent probability of error, what sample size should be taken.
Component Mean time standard deviationAnswer 0.1023 0.0183Service 0.5290 0.0902
Compute the skewness for your data set using Pearson's
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
An auditor for Health Maintenance Services of Georgia reports 40% of policyholders 55 years of older submit a claim during the year. Fifteen policyholders are randomly selected for company records. How many of the policyholders would you expect to ha..
what is the probability that the sample mean will be at least 1000? Do you need to use the central limit theorism to answer this question? explain.
Can you explain to me how the null and alternative hypothesis for one-sample testing differs from two-sample testing; and explain how these two hypothesis' are the same. Please provide a numerical example:
Explain the main differences among integers, rational numbers, real numbers, and irrational numbers. How are these used in everyday life? How would you explain the use of each to someone who did not know about the differences?
A random sample of 56 people measured accuracy w/ positive errors representing watches that are ahead of the correct time and negative rep. those behind the time.
The F-test cannot be used to answer whether or not there is a significant difference between the means.
Discuss where this common statistical analysis technique might be useful in your business. Is it being used already? If not, how will you help introduce others to it?
The sample produced a mean of 535 mL with a standard deviation of 0.47 mL. Assume that the distribution of the amount of lotion is approximately normal.
Marie claims she can predict the sex of pregnant women's babies for first-time new mothers. She sees 1000 women a year, and she always predicts a female. She charges $1000 for a prediction
Assuming the manufacturer's claim is true, what is the approximate probability of observing a sample mean of 52 months or less?
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