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a) In your environment (business or personal), please give an application of exponential smoothing and why you would use this technique.
b) In your environment (business or personal), please give an application of trend projection and why you would use this technique.
c) In your environment (business or personal), please give an application of moving average and why you would use this technique.
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
The board of directors of Saner Automatic Door Company consists of 12 members, 3 of whom are women.
At the .05 significance level, is there a difference in the mean number of miles traveled per month between Cincinnati and Pittsburgh employees? Use the five-step hypothesis-testing procedure.
Use the list of random digits below to assign 4 men and 2 women to the shark fin treatment. Read the table from left to right, first selecting the 4 men and then the 2 women. Use the numerical labels given in the chart to the names.
Pretend you are in charge of a packaging equipment company that is filling boxes of cereal. From past experience we know the population's mean weight of the filled boxes is 300 grams (and we know the distribution of grams is approximately normal).
Suppose we wish to test the null hypothesis that there are no differences among the proportion of men and women who developed a rash. Evaluate the P-value of the chi-square test of this hypothesis.
Based on a scatter diagram, would you estimate the linear correlation coefficient to be:
How variable is the number of service calls with which Sam's department must deal?
The sample was collected by interviewers going to people's homes in randomly chosen areas in each of the 9 countries. The population represented by this sample was:
Based on this sample information find out what percent of variation in starting salaries is described by GPA, and find out the equation that would forecast salary from GPA. Give a scatter plot.
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course:
Computing the Z scores for the given data and evaluate µ and σ for the population.
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