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The standard deviation of the population is 70 books per professor. An anthropologist wishes to find the 99% confidence interval for the mean number of books each professor has. How many professors must the anthropologist sample to obtain an average accurate to within 14 books per professor?
What is the p-value and compute a 95% CI for the difference in means between the two groups?
A sales person at a company sold 6,903,435 of hardware equipment last year, a figure that represented the eighth decile of sales performance at the company. What can you conclude about the salesperson performance?
Now imagine repeating the survey many, many times, each time recording a different sample mean commute distance. In the long run, a histogram of these sample means represents?
Find out a plausible value r for correlation between vehicle weight and miles per gallon (mpg) shown in the scattergram below?
Arrivals 2011. Will your flight get you to your destination on time? The U.S. Bureau of Transportation Statistics publishes information about airline performance.
Explain why a confidence interval for a predictor coefficient is equivalent to a 2-tailed test of significance?
He surveys several businesses and finds the standard deviation in monthly advertising costs is $23 for 12 hair salons, and $43 for 8 nail salons.
He argues that the regression effect says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
Investigate the cost of a home mortgage and to determine the monthly payment.
The election is one week away. You think you have the election sewn up, but the seem appears to be unraveling. You run a poll, draw a random sample of 500 adults.
What is the probability that the second one selected is defective given that the first one was defective? (c) What is the probability that both are defective?
The Federal minimum wage is $7.25 (effective July 2009). If an employee earns the new minimum wage, how many complaints can that employee expect to receive?
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