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1. A marketing company wants to determine if the combined years of experience of its staff who worked on a proposal have an impact on the chance of winning a contract. What is the equation of an appropriate model?
2. A health care facility is exploring the relationship between annual costs based on the number of patients seen and the number of emergency cases.(a) Explain what an outlier means in this context. How would you statistically test for the presence of an outlier?
(b) In this context, what do you do if you find some outliers?
(c) What would an influential observation be in this context?
(d) How would you test for the presence of influential observations?
One can calculate the 95% confidence interval for the mean with the population standard deviation known. This will give us an upper and a lower confidence limit. What happens if we decide to calculate the 99% confidence interval? Describe how the inc..
A passage that contains a rhetorical fallacy
What is a discrete probability distribution? Explain in your own words. What conditions must be satisfied by the probabilities in a discrete probability distribution? Explain what these conditions mean.
Suppose 10 teenagers are selected randomly to be interviewed about how they listen to music.
What are the different types of non-probability sampling? What are the different types of probability sampling? How would you describe their difference?
A group of 9 workers decide to send a delegation of 3 to their supervisor to discuss their grievances. If there are 4 women and 5 men in the group, how many delegations would include at least 1 woman?
Chi square analysis on occurrences of a rare disease in an rural area of 1000 people vs. national averages for this rare disease. Data is based on different age groups:
Describe the four patterns typically found in time series data. What is meant by the expression "decomposition" with regard to forecasting? Briefly describe the process.
Given a standard normal distribution
You gather data from two local churches about the average offering (a monetary donation to the church)that is collected at a weekly service. You want to see whether the average offering given at one churchis the same as the average offering at anothe..
For a normal distribution, the z-score boundary that separates the lowest 2.5% of the scores from the rest is z = -1.96
An article by Julia Moskin in the New York Times reports on the use of cheap wine in cooking.18 Assume that the following results are taste-test ratings, from 1 to 10, for food cooked in cheap wine.
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