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One should never use a regression line to predict the dependent response variable when the independent value is outside of the data range of the original data set that was used to fit the line.
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might be less practical than some other sampling methods.
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
Illustrate a quantitative assessment of what our charts would look like and what these new targets would do to our operations.
From the given probability distribution finite the mean and standard deviation.
A random variable has the density curve as in the graph below. Find The height of the density curve?
Using the following data on 15 workers, construct an exact 95% confidence interval for µ.
The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 dogs, they ran, on average, 19.2 meters per second with a standard de..
Explain probability distribution of X (name and parameters).
You want to create a 90% confidence interval for the true average number of yards per game he throws. What is the margin of error for this estimate?
Please give an example on higher wages vs. education level using a sample population of 30 men and women. Compute the measures of central tendency, dispersion, and skew for your data
What different types of variables are used in quantitative studies? Describe each type of variable and how they differ.
Suppose that bank has made a large number of loans of a certain type. The one year probability of default each loan 1.2%. The bank uses a Gaussian copula for time to default.
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