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The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03. The standard deviation is $0.10. At α = 0.01, is there a significant difference in price? Find the 99% confidence interval of the difference in the means.
Compute the sample variance and sample standard deviation as a measure of volatility of monthly total return for Chevron (to 2 decimals): Sample variance and Sample standard deviation.
Please use the regression procedure within Excel under Tools > Data Analysis to construct this equation.
Suppose U is a Unit (25, 50) random variable.Find the CDF of U and sketch a graph.
What was the purpose of calculating a Cohen's d? When is a Cohen's d calculated? Interpret d=.90. What does it mean in this example?
You are given the following frequency distribution for the number of errors 55 students made in a test:
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
What would you recommend Taylor do to cut back its labor cost? (Illustrate using an ABC plan.)
Develop a 90 percent confidence interval for the proportion of applicants that fail the test. (Round your answers to 2 decimal places.)
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
The gambler is paid later as follows, depending on the number of winners he picked. What is his expected gain? Remember, a loss is a negative gain, and that the bookie keeps the gambler's $20.
Assume that the average person in America weighs 150 pounds (μ). You want to determine whether colleges students weigh less than the average America, Following are the weights collected on a sample of colleges students: 120, 105, 166, 170, 145, 14..
Adele Weiss manages the campus flower shop. Flowers must be ordered three days in advance from her supplier in Mexico. Advance sales are so small that Weiss has no way to estimate the demand for the red roses.
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