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A test to detect pollutants is 90% accurate when pollutants are present in a sample and 96% accurate when pollutants are not present. This test is used on a set of samples of which 65% are polluted.
a) For a particular sample, what is the probability that the test says pollutants are present?
b) if the test says that pollutants are not present in a particular sample, what is the probability that is fact there are pollutant in the sample in question?
As people use the toothpaste, the amount remaining in any tube is random. Assume the amount left in the ube follows a uniform distribution. How much toothpaste would you expect to be remaining in the tube.
Assume that the probability for each customer to show up is 92%. (a) What is the probability that someone will be bumped out?
In an online survey of 4001 respondents, 8% were classified as productivity enhancers who are comfortable with technology and use the internet for its practical value. Suppose you select a sample of 400 students at your school, and the population ..
If 25 quarters are randomly selected calculate an interval that will include 95% of all the mean weights of randomly selected samples of quarters of size 25.
question consider the following three events based on a class of kindergarten students.event a nbsp student 1 has the
the u.s. adult population by age is as follows the world almanac 2009. the data are in millions of people. age number
Discuss ratio, interval, nominal and ordinal variables. Explain what is meant by a margin of error for a confidence interval.
The remainder are defective. If 4 of the products are randomly selected, find the probability that all of them are acceptable.
Do a two-sample test for equality of means assuming equal variances. Calculate the p-value. Comparison of GPA for randomly chosen college juniors and seniors: ¯ x1 = 3.05, s1 = .20, n1 = 15, ¯ x2 = 3.25, s2 = .30, n2 = 15, α = .025, left-tailed t..
We can assign probabilities to values of using the normal density curve with mean 0.30 and standard deviation 0.023. Use this density curve to find the probabilities of the following events.
A local bakery uses its stock of sugar according to demand for its products. Indeed, the weekly sugar use follows approximately a normal distribution with mean 2,400 lb. and with standard deviation 400lb.
A cyclist traveled at a rate of 32 mph to visit a nearby town. The cyclist averaged 10 mph on the return trip. If the round trip took 6.3 hours, find the distance to the nearby town.
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