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If random variables X and Y are normally distributed, X ∼ N(μ = 1,σ^2 = 2), and Y ∼ N(μ = 2, σ^2 = 3), fully characterize the probability density function of Z = 2X + 3Y.
If the sales, employment, production, and other business series increase or decrease over a period of time and approximate a straight line, the equation for this growth is given by
When summarizing interval-ratio variable data using descriptive statistics, what do we lose in our understanding of a sample if we just report the mean and not any measures of dispersion such as the interquartile range or standard deviation? How m..
A nutritionist claims that the mean tuna consumption by a person is 3.9 pounds per year. A sample of 80 people shows that the mean tuna consumption by a person
reconsider the previous problem about the age of a college students mother when the student was born. now suppose you
The multiple coefficient of determination was R2 = 0.783. The sample size used was n = 60 months (5 years of data). Analyze the results presented.
Run a Pearson correlation matrix on the variables measured on interval and scale ratio. Report the descriptive statistics and identify the strongest and weakest correlations.
x viscosity of a polymer with catalyst a was measured for 22 samples with resulted in sample average of 742 and
in a test of the drug lipitor 16.7 of the subjects treated with 10mg of atorvastatin experienced headaches. assume 60
Construct a 90% confidence interval for the overall proportion p of adults who say that movies are getting better.
Picking melons. Two stores sell watermelons. At the first store the melons weigh an average of 22 pounds, with a standard deviation of 2.5 pounds.
A newspaper reports that the gover- nor's approval rating stands at 65%. The article adds that the poll is based on a random sample of 972 adults and has a margin of error of 2.5%. What level of confidence did the pollsters use?
Is there sufficient evidence to conclude that a significant amount of improvement took place? Calculate the mean and standard deviation. Determine which test statistic applies, and calculate it.
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