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Given that z is a standard normal random variable, compute the following probabilities.
a. P(0 ‰ z ‰ .83)
b. P(1.57 ‰ z ‰ 0)
c. P(z > .44)
d. P(z ‰ ¥ .23)
e. P(z f. P(z ‰ .71)
you arrive at a bus stop at 800 a.m. knowing that the bus will arrive at some time uniformly distributed between 845
for the given pair of events classify the two events as independent or dependent. driving 30mph over the speed limit
Citing significant strides in math and science by women of all ethnic backgrounds, the College Broad says that the male-female gap on Scholastic Assessment Test scores continue to narrow among high school students.
A researcher claims that the average age of people who buy theatre tickets is 51. A sample of 30 is selected and their ages are recorded as shown below.
Suppose that verbal scores on SAT exam have a normal distribution with a population mean 500 points and population standard deviation of 100.
At the .01 significance level is there a difference in the mean amount purchased on an impulse at the two stores? Explain these results to a person who knows about the t test for a single sample but is unfamiliar with the t test for independent me..
A simple random sample of 50 adults is obtained, and each person's red blood cell count (in cells per micro-liter) is measured. The sample mean is 5.23. The population standard deviation for red blood cell counts is 0.54.
At 0.01 level of significance, is there evidence that mean price is higher at Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (i).
1. the regression line y -3 2.5 x has been fitted to the data points 28 60 20 50 10 18 and 25 55. the sum of the
assume that 67 ofthe cars on a particular freeway are traveling faster than70 miles per hour. arandom sample of 15 cars
A financial advisor has recommended two possible mutual funds for investment: Fund A and Fund B. The return that will be achieved by each of these depends on whether the economy is good, fair, or poor.
Gas Station pump signs, at one chain, encourage customers to have their oil checked, claiming that one out of every four cars should have its oil topped.
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