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The probability that a person in the United States has type O+ blood is 40%. Three unrelated Americans are selected at random. What is the probability that at least two out of the three have blood type O+. (Give answer to 4 decimal places.)
Recently, students in a marketing research class were interested in the driving behavior of students. Specifically, the marketing students were interested if exceeding the speed limit was related to gender.
The machine will stop working if more than three components fail. Find the probability that the machine will be working.
What is the smallest number of consumers that Timex can survey to guarantee a margin of error of .05 or less at a 99% confidence level and calculate the intervals correctly
There are 137 tickets in a hat and my name is on 3 of them. If someone draws 20 tickets out of the hat, what is the probability of my name being on one of those 20tickets.
A video rental store has two video cameras available for customers to rent. Historically, demand for cameras has followed this distribution:
What is the value of this statement in terms of the research process? What is the relevance and relationship of this statement to today's technology-advanced business world?
To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 25 children diagnosed with the disorder and measure each child's attention span before and after taking the drug.
Consider the following frequency table of the performance ratings on a scale of 1-good, 2-fair, and 3-poor, bestowed on their local baseball team by a collection of 100 fans:
Use a 5% significance level to test the claim that there appears to be a difference in the effectiveness of the two diets.
the number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a
a researcher would like to determine if relaxation training will affect the number of headaches for chronic headache
Use this information to construct a probability table, and then calculate each of the following probabilities:
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