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Discuss how a t Test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students. Why would this t Test be preferred to using another test statistic?
Public health statistics indicate that about 26.4% of Americans smoke. Suppose a random sample of 50 people is selected. Approximate the distribution of the same proportion with the normal model.
Assume the population standard deviation is 7.1 mpg. State the correct null and alternative hypotheses that the company wishes to test. Calculate the test statistic that would be used for conducting the desired test.
One set of 12 pairs of scores, X and Y values, produces a correlation of r = 0.90. If SSy = 200, find the standard error of estimate for the regression line.
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean (to 4 decimals)?
The standard deviation of this poll is 4%. What would be the standard deviation if the sample size were increased from 93 to 187?
in statistics you learn about type i and type ii errors. a type i error occurs when a statistical test rejects a
Discuss how you would investigate the operations of the plant to determine why the proportions were off the targeted values. Speculate on three or more possible conditions in plant and bagging process that could have caused the observed results.
Construct a 95 percent confidence interval for the true mean.
It costs ABC $0.5 per pound to ship the box containing the weights. Because it's an odd-shaped package, though, shipping the bar costs $0.6 per pound plus a $10 surcharge. Find the mean and standard deviation of the company's total cost for shippi..
a coin is tossed twice. let z denote the number of heads on the first toss and w the total number of heads on the 2
Test whether there is difference in the two population mean. Use p-value approach
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