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A racing car consumes a mean of 101 gallons of gas per race with a variance of 49. If 43 racing cars are randomly what is the probability that the sample mean would differ from the population mean by greater than 2.4 gallons.
What fraction of the calls last between 4.2 and 5 minutes?
the time it takes alice to walk to the bus stop from her home is normally distributed with mean 13 minutes and variance
of a random sample of 90 firms with employee stock ownership plans 40 indicated that the primary reason for setting up
How many free throws must the second player make in a row in order to confidently reject the same null hypothesis? Use the 95% level of confidence for both players.
in a large american university in 1969 the male and female professors were sample independently yielding the following
a drug tester claims that a drug cures a rare skin disease 77 of the time. the claim is checked by testing the drug on
The rejection region for a two-tail test that uses the standard normal distribution is that area under the distribution lying
for the distribution in the following table what is the percentile rank for x
Store A has signed a revenue-sharing contract with a movie studio for DVDs. Each DVD costs the studio $2 to produce, and will be sold to Store A for $5. Store A in turn prices a DVD at $15 and forecasts demand to be normally distributed with mean 5,0..
suppose you have some data gathered from a repeated experiment. if you want to make inferences about the data collected
dr. fred reesurch has developed an experimental drug for treating eczema a skin disease. he needs to test it out on
one method for assessing the effectiveness of a drug is to note its concentration in blood andor urine samples at
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