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One of the most popular products sold by a manu- facturer of electrical fuses is the standard 30-ampere fuse used by electrical contractors in the construction industry. The company has tested a simple random sample of 16 fuses from its production output and found the amperages at which they "blew" to be as shown here. Given this information, and assuming the data are from a normally distributed population, construct and interpret the 95% confidence interval for the population mean amperage these fuses will withstand.3
30.6 30.2 27.7 28.5 29.0 27.5 28.9 28.1
30.3 30.8 28.5 30.3 30.0 28.5 29.0 28.2 amperes
A teacher figure that final grades in the statistics department are distributed as A,25%, B, 25%, C, 40%, D, 5%, F, 5%. At the end of the randomly selected semester, the following number grades were recorded.
Assuming that the life of bulbs follow Normal distribution, what is the probability that a randomly selected bulb will: Fail within 1200 hours? Survive between 1350 and 1650 hours?
1. the sample size necessary for a 90 confidence interval to keep the maximum error to within 12 of a standard
Let a b in R and let f be continuous from [a, b] into R. Show that f takes all values between f (a) and f (b). Hint: Apply parts (a), (b) and (c).
a sample of size 100 has a sample standard deviation of 25. what is the standard error of the sample mean? give your
Find out the confidence interval for the population mean also interpret the result. A researcher is interested in whether social assertiveness might be influenced by training procedures.
What proportion for smoking teenagers think their peers care a lot about keeping their weight down?
why the rise in performance on IQ tests contrasts with a steady decline in performance over the past decades on many standardized tests,
Explain the meaning of the multiple correlation coefficient R. What is the range of values R can assume? What are the hypotheses used to test the significance of R?
we have a bag with 10 red 10 blue and 20 green marbles. you draw two marbles out of this bag without replacement. what
an automatic hopper car loader is set to put 75 tons of coal into each car. the actual weights of coal loaded into each
What is the value of the sample test statistic? (Round your answer to two decimal places.) Find the P-value of the test statistic. (Round your answer to four decimal places.)
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