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Internet Access via Cell Phone Fourteen percent of cell phone users use their phone to access the Internet. In a random sample of 10 cell phone users, what is the probability that exactly 2 have used their phones to access the Internet? More than 2?
Here are fifty observations on the weight of tea bags. Calculate the Standard Deviation and Variance.
What then is the probability that a shaft will be acceptable? Suppose that the diameter of the shaft is a random variable that is Normally distributed.
Use the marginal probabilities of school quality, school cost or convenience, and other to comment on the most important reason for choosing a school.
One professor teaches a large section, section A, of a particular class, and on the first test of the term, the test scores in section A were approximately normally distributed with a mean of 78 and a standard deviation of 6.
If the researcher computes the t-statistic to be 4.2 and t-value found in t table for df=60 and level of significance of 0.5, is 2.0 researcher would accept or reject null hypothesis.
You are investigating the flight characteristics of different kinds of birds. You collect a sample of 33 European swallows (Hirundo rustica) and measure their air-speed velocity in a borrowed wind tunnel.
Assuming this is literally true, how can it be explained? What facts / statistics would you need to know to expose this misleading claim?
Pizza House offers 4 different salads, 5 different kinds of pizza, and 4 different desserts. How many different three course meals can be ordered?
A deck of 52 cards is dealt face up in a row. What is the probability that all 4 aces and all 4 kings are adjacent (but in any order)?
Which test do we use to see if the difference in our sample is statistically significant? Why? Should it be one or two-tailed?
Give an example representing a discrete probability distribution and a continuous probability distribution. Explain why your choice is discrete and continuous.
What extremely important characteristic of the data set is not considered in the hypothesis test?
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