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A statistics student plans to use a TI-84 Plus calculator on her final exam. From past experience, she estimates that there is 0.92 probability that the calculator will work on any given day. Because the final exam is so important, she plans to use redundancy by bringing in two TI-84 Plus calculators. What is the probability that she will be able to complete her exam with a working calculator? Does she really gain much by bringing in the backup calculator? Explain.
normal approximation to the binomial distribution.at a certain community college 60 of the students are female. if 300
1. the following study is a very famous medical study called the physicians health study i. it was begun in 1982 and
Each morning, coffee is brewed in the school workroom by one of three faculty members, depending on who arrives first at work.
The results are n = 65 and r = 0.37. Is there statistical evidence of a linear correlation between the two variables?
A large company buys thousands of lightbulbs every year. The company is currently considering four brands of lightbulbs to choose from.
For its validity, all hypothesis testing depends heavily on the assumption that the sample that is used was drawn using probability sampling techniques.
Write the probability model for the points from this game, and find the expected value and the standard deviation.
Comparing weight-loss treatments Twenty overweight females have agreed to participate in a study of the effectiveness of four weight-loss treatments.
The consumer advocate claim that 80% of cable televion subcribers are not satisfied with their cable service. In the attempt to justify this claim, a arbitarily chosen sample of cable subcribers will be polled in this issue.
a sewage plant produces 50000 gallons a day. 20 of the time it produces in excess of 60000 gallons what is the
IQ and grades Do students with higher IQ test scores tend to do better in school? The figure below shows a scatterplot of IQ and school grade point average.
the scores of a random sample of 8 students on a physics test are as follows 60 62 67 6970 72 75 and 78. test to see if
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