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A company which produces AA batteries tests lifetime of random sample of 40 batteries using special device designed to imitate real-world use. Based on testing, company makes following statement: "Our batteries last the average of 430 to 470 minutes, and our confidence in that interval is 95%" Find out standard deviation and show work.
Ages of 56 attendees of a Harry Potter movie are shown. (a) Form seven age classes (10 to 20, 20 to 30, etc.). Tabulate the frequency of attendees in each class.
Probability using discrete distribution.The probability distribution for the random variable x follows.
In a water treatment plant, the turbidity level, and is suspected is linearly related to inches of accumulated rainfall in the month, x. The following information related to the waste water plant is available:
Assume we know the length of time a battery will hold a charge is a normal distribution with a mean of 50 hours and a standard deviation of 15 hours.
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
The dean of students believes that teh costs are greater this semester. What is the test value for this hypothesis?
An insurance company has determined that each week an average of nine claims are filed in their Atlanta branch. What is the probability that during the next week
Use a significance level of alpha = .05 to test the claim that p > .5. The sample is a simple random sample n = 50. Show how to calculate beta for the test and assume the true population proportion is .6.
Suppose you toss a die 100 times in a row. What is the probability that you see 4 spots between 10 and 20 times?
You have been asked to help plan a data collection process to answer the two problem areas. Briefly outline a plan to: Collect qualitative data about how the current services are delivered
She figures that each box costs $ 2.59 plus $ 0.21 shipping and handling, which totals $ 2.80, then she adds $ 0.70 profit to each box and sells it for $ 3.50. Do you think this is a good pricing strategy? How would it compare to marking up by a p..
Using standard methods for linear statistical prediction, find the percent increase in sales revenue that would be expected if the price were lowered by 15%. Find the usual measure of the strength of association between price reduction and sales re..
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