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Question: Association. Suppose you were to collect data for each pair of variables. You want to make a scatterplot. Which variable would you use as the explanatory variable and which as the response variable? Why? What would you expect to see in the scatterplot? Discuss the likely direction, form, and strength.
a) Long-distance calls: time (minutes), cost
b) Lightning strikes: distance from lightning, time delay of the thunder
c) A streetlight: its apparent brightness, your distance from it
d) Cars: weight of car, age of owner
Then restate each fact in words in terms of the number of ways that k successes can be distributed among n observations.
b. If the forecast in May was 42, develop a forecast for December based on exponential smoothing with α = 0.25. c. For the data set below, determine the bias, the mean squared error and the mean absolute deviation.
Nielsen Monitor-Plus, a service of Nielsen Media Research, is one of the leaders in advertising information services in the United States.
If the sample size had been 15 rather than 40, could the probability requested in part (a) be calculated from the given information?
If the company loses contract A, the probability winning contract B decrease to .2. Find the probability of the following events. Winning both contracts
Determine the probability distribution for the number of Hondas in a sample of three cars chosen from the top nine and what is the likelihood that in the sample of three at least one Honda is included?
How many ways might there be in picking a small group of 6 people from a large group of 20 people?
suppose that the joint density for xy is uniform over the disc centered at the origin with radius 1.a calculate the
Can you describe a data set for which one would one would prefer to use the median rather than the mean and can you think of a situation for which the mean would be preferred to the median and the mode?
Assuming that the samples come from a normal distribution: Test that the mean SAT score for math in 1999 is greater than that in 1989 at α = 0.05. Assume the variances are equal.
question two different lab machines measure the sodium content in milligrams of the same 10 blood samples below. at
Hypothesis test for one population mean - What is the alternative hypothesis and What is the null hypothesis?
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