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In a survey of 153 publicly-traded companies, the average price-earnings ratio was 17.6 with a standard deviation of 8.8. When testing the hypothesis (at the 5% level of significance) that the average energy use has decreased from the past value of 16.5, what is the critical value
What are confounds? Give an example of a design that has three confounds. Describe three ways to alter the design to address these confounds and explain the advantages and disadvantages of each.
What is the probability that my sister has blue eyes? (As stated in Problem 42, an individual who receives a blue-eyed gene from each parent will have blue eyes, whereas one who receives one blue-eyed and one brown-eyed gene will have brown eyes.)
Which of the following would be a reason to choose a Moving Average Forecast model instead of a Naïve Model to forecast a series of data into the future?
According to TNS Intersearch, 69% of wireless web users use it primarily for receiving and sending e-mail. Suppose that three wireless web users are selected at random. What is the probability that all of them use it primarily for e-mail?
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might.
A student randomly guesses on all 25 questions of a true-false test. Use the normal approximation to the binomial to approximate Pr[ ], that is, that the student gets 10 or fewer questions correct.
I choose 5 tickets at random with replacement. Let X be the number of different colors that appear.
Let F be a CDF which is continuous and strictly increasing. Let µ be the mean of the distribution. The quantile function, F-1, has many applications.
The Sentry Lock Corporation manufactures a popular commercial security lock at plans in Macon, Louisville, Detroit, and Phoenix. The per unit cost of production at each plant is $35.5, $37.5, $39, and $36.25, respectively, while the annual product..
The mean SAT verbal score is 412, with a standard deviation of 90. Use the Empirical Rule to determine what percent of the scores lie between 412 and 592.
suppose that the average grade for all people who take this course in statistics is 83 with a standard deviation of
It can literally be anything from how they manage their employees or details and reasons as to why they are successful, etc. answer in a detail paragraph
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