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Leakage from underground gasoline tanks at service stations can damage the environment. It is estimated that 25% of these tanks leak. You examine 15 tanks chosen at random, independently of each other.
(a). What is the mean number of leaking tanks in such samples of 15?
(b). What is the probability that 10 or more of the tanks leak?
(c). Now you do a larger study, examining a random sample of 1000 tanks nationally. What is the probability that at least 275 of these tanks are leaking?
In hypothesis testing when is a two-tail test used in lieu of a one-tail test?
suppose you were given the task of estimating the proportion of drivers in troy al who text while they drive. discuss
Suppose you want to test the claim the the paired sample data given below come from a population for which the mean difference is ud=0. The mean value of the differences for the paired sample data.
show that the distribution of a random variable x with possible values 0 1 and 2 is determined by -li ex and -l2 ex2
The direction of the pigeons" loft is 149 degrees from their release point. Do the pigeons, on average, fly directly to the loft?
Find the least-squares regression line to predict chirps per second based on temperature. increase in temperature. Predict the chirps per second if it is 83.3 degrees.
While in July the mean high temperature is 74oF and the standard deviation is 8oF. In which month is it more unusual to have a day with a high temperature of 55oF?
(TCO A) Consider the following raw data, which is the result of selecting a random sample of 20 condominium sales in a particular development. The sale prices are given in thousands of dollars
a box of tickets has an average of 100 and sd of 20. four hundred draws will be made at random with replacement from
At a large university, a mathematics placement exam is administered to all students. Samples of 36 male and 30 females are randomly selected from this year's student body and the following scores recorded.
questionnew spark plugs have just been installed in a small airplane with a four-cylinder engine. there is one spark
iq scores in a certain population are normally distributed with a mean of 95 and a standard deviation of 13. give your
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