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1. Using the hardness data from the odor data set odor .txt, do the following.
(a) Make a normal probability plot of the data.
(b) Do the data appear to be normally distributed? Explain.
2. Use the web site data webvisit .txt to do the following.
(a) Make a normal probability plot for the entire data set.
(b) Make normal probability plots for the two apparent groups in the data.
(c) Calculate the mean and standard deviation for each group.
(d) Assuming the group with the larger values is normally distributed, use your calculated mean and standard deviation to estimate the proportion of days that have more than 15,300 visits.
(e) Write a paragraph describing this set of data and the conclusions you have drawn from it.
Suppose in an attempt to develop marketing materials Tyco marketers are interested in determining whether there is a significant difference in the cost of replacing pipeline seals in different countries.
1.students often incorrectly believe that inference for a population proportion based on the sample proportion is
the bureau of labor statistics reported that the mean amount spent per year by all american citizens on tobacco
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
What is the expected number of contracts that it will win? What is the expected profit for each contract? What is the company's expected total profit on these three bids?
As you did in StatCrunch Assignment 1B, look at the items in the StatCrunch U survey and develop a question regarding population proportions that can be answered using the survey data you collected.
a pharmaceutical company receives large shipments of ibuprofen tablets and uses this acceptance sampling plan randomly
Determine the probability of exactly one success given Poisson distribution with mean of 2.0.
if you were given a large data set such as the sales over the last year of our top 1000 customers what might you be
1. What are degrees of freedom? How are the calculated? 2. What do inferential statistics allow you to infer?
Pollsters attempt to find out whether or not person is a "likely voter" before they count their opinion in poll. If we suppose 40% of registered voters will really vote.
calls to the help line of a large computer distributor follow a passion distribution with a mean of 20 calls per
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