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Suppose we have an urn containing c yellow balls and d green balls. We draw k balls, without replacement, from the urn. Find the expected number of yellow balls drawn. Hint : Write the number of yellow balls drawn as the sum of c random variables.
The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03.
there are six ways in which a person and the situation interact to shape a persons goals thoughts feelings and
a firm wanted to see if there was a significant difference between two neighboring communities in terms of the mean
a basket of 1000 parts is selected at random from a shipment of 50 baskets. the chance of any single part being
If we assume all the possible random samples of 250 students at this university, 95 percent of the samples should have means among what two numbers.
Find the power of the test to determine if the the new cream is effective, when the mean percent weight reduction is actually 2.4%. Assume that the population standard deviation is 7% and that the significance level is α=0.03.
The mean of a normal probability distribution is 60; the standard deviation is 5.
How do you go about calculating different probabilities--say an item was selected at random and we wanted to know how far it is from the mean or the probability that it is at least 4.5 or more?
For a random sample of 50 batteries, what is the probability that the sample mean will be less than 27.5 hours?
the weight of an organ in adult males has a bell shaped distribution with a mean of 310 grams and a standard deviation
how much the mean changes?
What do you think of this sampling strategy? What impact does it have on the ability of the charts to detect assignable causes.
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