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1. Discuss the strengths and weaknesses of correlational and regression studies; discuss concepts such as positive and negative correlations, correlation coefficients, confounding, and causality.
2. You read an interesting study in the paper that says that during any given year, statistics show that ice cream consumption and the crime rate are correlated - as ice cream consumption rises, the crime rate rises; as ice cream consumption drops, so does the crime rate. Explain this spurious correlation.
Conduct a 3-period moving average, an exponential smoothing forecasting using an alpha of .25, and a seasonal forecast with 3 seasons.
A random sample of 100 observations is obtained from a normally distributed population with a standard deviation of 10. What is a 95% confidence interval for the mean of the population if the sample mean is 40?
If the server has 40 customers in one shift, what is the probability that her total tips are less than $250? (Assume that these 40 customers represent a simple random sample).
Prepare a 95% confidence interval for the average grocery bill. Would a 99% confidence interval be narrower or wider than the 95% confidence interval?
John conducted his study to measure self-esteem among victims of domestic violence before and after they complete an 8-week program for abuse victims with 10 individuals. He calculated t = 1.9 from his data.
Construct a 95% confidence interval for the proportion and calculate the P value for the given test.
Below is a plot of the Olympic gold medal winning performance in the high jump (in inches) for the years 1900 to 1996.
A startup company began manufacturing toy dolls tailored to environmental-oriented customers. Using linear regression, find a linear model for the Cost Function if the company's yearly costs for the next five years were (2005,$8,000,000),(2006,$1..
Determine and plot the probability mass function and probability distribution function of the contract award amount (in millions of dollars).
The starting salaries of individuals with an MBA degree are normally distributed with mean of $40,000 and standard deviation of $5,000. What percentage of MBA's will have starting salaries of $34,000 to $46,000?
There are 5,000,000 Adults 25+ in Mtown. An advertiser buys a schedule on Channel 45: 20 spots in early news with an average A25+ quarter hour audience of 150,000, 25 spots in daytime with an average A25+ quarter hour audience of 200,000, and 10 s..
The Wall Street Journal reported some interesting statistics on the job market. One statistic is that 40% of all workers say they would change jobs for "slightly higher pay."
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