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Historically, evening long distance phone calls from a particular city have averaged 15.20 minutes per call. In a random sample of 25 calls, the sample mean time was 14.30 minutes per call, with a sample standard deviation of 2 minutes. Use this sample information to test whether or not there has been a change in the average duration of long distance phone calls. Use a .05 level of significance. What is the p value?
Costs of Television: Listed below are prices (in dollars) and quality rating scores of rear-projection televisions. All of the televisions have screen sizes of 55 or 56 inches.
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important?
If a group of 400 school children are selected at random, what is the probability that at most 70 children will miss school because of asthma?
Drug testing of job applicants - In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 significance level, test the claim that the failure rate is now lower if a simple random sample of 1520 current job applicants ..
They answered in 230 seconds per call with a standard deviation of $40. Can the company claim that they are faster than the average utility?
Find the probability that the mean weight of those loads is less than 42.00 tons. Assume that the variable is normally distributed.
Illustrate is the range of values for a coefficient of correlation. Illustrate degree of relationship do values of the correlation coefficient (r)with magnitudes close to 1.00 indicate.
Write the event "at least one nonword error" in terms of X. What is the probability of this event? Describe the event X ≤ 2 in words. What is its probability? What is the probability that X
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
If the sample mean is 12.7 oz. and the sample standard deviation is 0.70 oz., find the 95% confidence interval of the true mean.
Independently of all the others. The system is operational if no two adjacent lamps fail. Obtain an expression for system reliability.
Using a sample of size n=120, what is the standad deviation of our estimator P? What is the probability that the sample proportion will be at least 0.45?"
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