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21st Century Insurance Company claims that telephone calls for policy holder information are answered in at most 3 minutes. A random survey of 36 phone calls results in the mean 3.3311 and standard deviation 2.1788. Is there sufficient evidence to disprove their claim? Alpha .05
Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes. a) What is the probability that the sample mean is between 7.8 and 8.2 minutes?
In the sample of 400 households, 112 were watching the series. At the 5% significance level, would the series be judged successful on basis of this sample information?
If the lowest score you can earn and still be eligible for employment is an 84, what is the mean score for the exam? Round your answer to the nearest tenth.
Employ a four period moving average and determine the forecasted demand for August. Put your answer in the form xx.x with no additional numbers or symbols.
Two events are mutually exclusive: If their intersection is 1, If they have no sample points in common.
Compute a 95% confidence interval for the population proportion of positive drug tests. Explain why is the normality assumption not a problem despite the very small value of p.
To perform a certain type of blood analysis, lab technicians must perform two procedures. The first procedure requires either 1 or 2 separate steps, and the second procedure requires either 1, 2, or 3 steps. a) List the experimental outcomes assoc..
What type of error would result in that case? Respond to at least two of your classmate's postings.
In a class roster of 18 students, what are the chances that there are at least 2 people with the same birthday (same day, not same year)?
Describe why ordinary least squares solution is not unique. What can you say about residuals of any solution? Is ridge regression solution unique? Explain why or why not?
In a certain state, an appeals court consists of seven judges. For a routine case, three judges are chosen at random as a panel to hear a case and render a decision. How many distinct panels can be formed?
An article reports that when each football helmet in a random sample of 44 suspension-type helmets was subjected to a certain impact test, 25 showed damage.
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