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10.3% of students in statistics actually take the course because they want to. If two students are selected at random, find the probability that both took statistics because they wanted to.
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
The first and third quartiles were 17.95 and 35.45 miles per gallon, respectively, Develop a box plot and comment on the distribution. Is it a Symmetric distribution?
In ANOVA, which of the following is not affected by whether or not the population means are equal?
Assume the population standard deviation is 1.2 hours. The standard error of the mean is:
A population has a mean of 53 and a standard deviation of 21. A sample of 49 observations will be taken what is the probability that the sample mean will be greater than 57.95?
Mariott estimates that the penalty to "walk" a guest whose reservation cannot be honored due a lack of space is approximately $100. What is the ideal probability of "walking a guest."
If x is a binomial random variable where n=100 and p=.1, find the probability that x is less than or equal to 11 using the normal approximation to the binomial.
Calculate a 95% confidence interval on the average weight of packaged mustard seed. Explain very carefully to the packaging workers what the 95% confidence interval numbers mean. Include your Excel output. Is there anything you would want to note ..
In a class, the grade of a student on an exam is an RV with expectation 60 and variance 16. If the class average is between 55 and 65, with a probability greater than or equal to 0.9, determine the number of students that have taken the exam.
It has been reported that the average US office worker receives 14 fax messages per day. For purposes of this exercise, we will assume that the daily number of fax messages is normally distributed with a standard deviation of 5.0 messages.
A sample of 23 European countries found that variance of life expectancy was 7.3 years. Determine the 95% confidence interval estimate for variance of life expectancy in Europe?
Determine the critical z values. Suppose that normal distribution applies. Right-tailed test; standard deviation = 0.04.
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