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Suppose that the length of life in hours (say, X) of the light bulb manufactured by company A is N(800,14400) and the length of life in hours (say, Y) of a light bulb manufactured by company B is N(850,2500). one bulb is randomly selected from each company and is burned unitl "death"
(a) Find the probability that the length of life of the bulb from company A exceeds the length of life of the bulb from company B by at least 15 hours.
(b) Find the probability that at least on eof the bulbs "lives" for at least 920 hours.
Averaging 204 pins with a standard deviation of 24.9, can one conclude at a level of significance of .01 that the new ball has improved his game?
If you know you need a sample size of 1,063 out of 300,000 to get a 95% confidence level and a 3% confidence interval what steps would you take to get a random sample?
it is estimated that 75 of a grapefruit crop is good the other 25have rotten centers that cannot be detected until the
the mean and standard deviation of the max loads supported by 60 country bridges in texas is 11.09 tons and 0.73
A hypothesis will test that two population means are equal. A sample of 10 with a standard deviation of 3 is selected from the first population and a sample of 15 with a standard deviation of 8 from the second population.
A Leading Candy bar is claimed to have, on average,
Write in interval notation the real numbers greater than or equal to 3 and less than 9. Translate the verbal expression into an algebraic expression: a cubed minuis b cubed.
Using the p-value approach, test the hypotheses at the 1% level of significance.
what is the t-test based on students t-distribution useful for?a. comparing values about the meanb. determining if the
Give an example of a hypothesis test you could perform at a Surgery Center and what the hypotheses would be. State the null and alternative hypotheses in proper format.
Sample from a normal population having a standard deviation of 0.04, what is the probability that the mean of a random sample of size 25 will be "off" by at most 0.02.
A consumer is contemplating the purchase of a new compact disc player. A consumer magazine reports data on the major brands. Brand A has lifetime (TA) which is exponentially distributed with m=.02; and Brand B has lifetime
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