After an outbreak of diarrhea following a reception at an orchestra concert, you are charged with investigating the cause. What statistical test should be used to test the null hypothesis that the proportion of people becoming ill among those who ate at the reception to the proportion becoming ill among those who did not eat at the reception?
The expected (mean) life of a particular type of light bulb is 1000 hours with a standard deviation of 50 hours. The life of this bulb is normally…
1. The expected (mean) life of a particular type of light bulb is 1000 hours with a standard deviation of 50 hours. The life of this bulb is normally distributed. What is the probability that a randomly selected bulb would last longer than 1150 hours? 2. The average hourly wage of workers at a fast food restaurant is $6.50/hr with a standard deviation of $0.45. Assume that the distribution is normally distributed. If a worker at this fast food restaurant is selected at random, what is the probability that the worker earns more than $6.75? 3. Let X be a normal […]
The following table summarizes the results of a two-factor ANOVA evaluating an independent-measures experiment with 2 levels of factor A, 3 levels of…
The following table summarizes the results of a two-factor ANOVA evaluating an independent-measures experiment with 2 levels of factor A, 3 levels of factor B, and n = 8 participants in each treatment condition. A. missing values in the table
Let X have a uniform distribution U(0, 2), and let the conditional distribution of Y, given that X = x, be U(0, x 2 ). (a) Determine f (x, y), the…
Let X have a uniform distribution U(0, 2), and let the conditional distribution of Y, given that X = x, be U(0, x2). (a) Determine f (x, y), the joint pdf of X and Y. (b) Calculate fY(y), the marginal pdf of Y. (c) Compute E(X | y), the conditional mean of X, given that Y = y. (d) Find E(Y | x), the conditional mean of Y, given that X = x.
Exercises The American Association of Individual Investors (AAII) On-Line Discount Broker Survey polls members on their experiences with electronic…
Exercises The American Association of Individual Investors (AAII) On-Line Discount Broker Survey polls members on their experiences with electronic trades handled by discount brokers. As part of the survey, members were asked to rate their satisfaction with the trade price and the speed of execution, as well as provide an overall satisfaction rating. Possible responses (scores) were no opinion (0), unsatisfied (1), somewhat satisfied (2), satisfied (3), and very satisfied (4). For each broker, summary scores were computed by computing a weighted average of the scores provided by each respondent. A portion of the survey results follows (AAII website, February […]
