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The diameters of bolts produced by a certain machine are r.v.'s dis- tributed as N(m, s2). In order for the bolts to be usable for the intended purpose, the s.d. s must not exceed 0.04 inch. A sample of size 16 is taken and is found that s = 0.05 inch. Formulate the appropriate testing hypothesis problem and carry out the test if a = 0.05.
Determine and interpret a 95% confidence interval for the mean amount of time Americans age 15 or older spend eating and drinking each day.
Find the probability that 10 customers will arrive in a particular 15-minute period. Set up the mathematical model and use the table.
a man pays 400 for a 1 year life insurance with coverage of 200000.given his age he has a .995 chance of living for at
Perform a hypothesis test to determine if there is a significant correlation (α =0.05) between number of hours of overtime worked and hours of sleep
let 18 and 10 be the standard deviations of the independent random variables x and y respectively.what is the standard
Perform a hypothesis test by using.04 level of significance to find out if there is a difference between the population means.
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were:
1. suppose the average thread-life of a certain brand of tire is 42000 miles and that this mileage follows the
Jared bets on the number 7 for each of 100 spins of a roulette wheel. Because P(7) = 1/38 he expects to win two or three times. What is the probability that Jared will actually win two or more times?
in an analysis investigating the usefulness of pennies the cents portions of 100 randomly selected credit card charges
a research firm tests the miles-per-gallon characteristics of three brands of gasoline. because of different gasoline
Compare and contrast random selection and random assignment. Be sure to include a discussion of when you would want to do one or the other and the possible consequences of failing to do random selection or random assignment in particular situation..
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