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Finding the sample size increased by mean and standard deviation
As the sample size increased the mean (mu sub x bar) and standard deviation (sigma sub x bar) of a sampling distribution will approach which of the following values?
a) mu divided by n, sigma divided by n
b) mu, sigma divided by the square root of n
c) mu divided by square root of n, sigma divided by mu
d) mu squared, sigma squared
Make a forecast for 2004, using either the fitted trend model or a judgment forecast. Why is it best to ignore earlier years in this data set?
The Minneapolis Tribune ran an article on gender differences in shopping behavior. When 400 women were asked to respond to the question "Where I shop is influenced by which store has a greater variety," 60% answered "Yes.
If standard deviation is 50 hours and α is equal to 0.01, what values for mean x will result in rejection of null hypothesis.
What is the probability that more than one machine is in the system? Probability that more than two are broken and waiting to be repaired or being serviced? More than three? More than four?
Construct a 98% prediction interval for the selling price of a 4l- year old house having 4500 square feet, 13 rooms, and an attached garage.
A newspaper reports have 58 percent of farmers are planning to plant genetically modified crops presesnt year. The article adds that the poll is based on a random sample.
Show some work for each part. A diagram can be helpful. A survey of adults found the following: 65 percent of the adults drink coffee. 35 percent drink tea. 80 percent drink coffee or tea (or both). If we choose a surveyed adult at random, find t..
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Use normal approximation to determine probability that x = 2. Illustrate all work.
Set up dummy coded dummy variables to contrast each of the other groups to Group 2, medium Anxiety; run a regression to predict exam performance (Y) from these dummy coded dummy variables.
On randomly selected day, let X and Y, respectively, be proportions of time that the drive-in and walk-in facilities are in use. Determine the marginal density of X.
What statement can you made by using the rule of three, about the proportion p, of all its computers which are defective?
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