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1. Suppose that from the past experience a professor knows that the test score of a student taking his final examination is a random variable with mean 66 and standard deviation 11. How many students would have to take the examination to ensure, with probability at least 0.94, that the class average would be within 1.5 of 66?
2. A multiple-choice test consists of 29 questions with possible answers of a, b, c, d, e. Estimate the probability that with random guessing, the number of correct answers is at least 11.
Identify a business situation where you might want to make an estimate. For example, you might want to estimate the mean dollar amount spent by customers at a retail store.
Under what situations on lambda1 and lambda2 will this system have the steady state distribution? Describe your answer.
The new study is going to use the confidence level of 90%. The estimator or appreciative must be in 1% of the population proportion. Which is the necessary size of the sample?
assume that you plan to use a significance level of ? 0.05 to test the claim that p1 p2 use the given sample sizes
Perform a paired-samples t-test for experiment (p = .01 or 99% confidence, two-tailed). Is there a significant difference between the two teaching methods?
Pepsi wants to use this technique to determine if they should bid for an exclusivity agreement with NCSU. Such an agreement would bind NCSU to sell Pepsi soft drink products exclusively on campus.
in conjunction with the housing foreclosure crisis of 2009 many economists expressed increasing concern about the level
according to the texas department of state health services there are approximately 17.7 million adults age 18 living in
1. a matched pairs experiment compares the taste of instant versus fresh-brewed coffee. each subject tastes two
a shipment of 1000 small lab mice arrives at the animal care facility with a nominal weight of 10 g per mouse. a sample
With your start time being random and uniformly distributed in this interval. What is the PDF of the time that you have to wait for the first train to arrive?
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
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