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1. Let W = a drum tare weight in pounds (i.e., the weight of the empty drum). Suppose W "' N(58, 0.13).
(a) Find P(W > 58.5).
(b) Find P(57.8 W 58.2).
(c) Find the 99th percentile of W.
(d) Find the 10th percentile of W, and explain what it stands for.
2. Use the fact that an N ( µ, cr2 ) random variable Y can be written as Y = er Z +µ to show that Qy (p ) = crQz (p ) + µ.
3. By differentiating the distribution function of a WEIB( 8,,6) random variable (equation (4.3.28) ), show that its density is given by equation (4.3.29).
The average weight of adult men is 172 pounds with a standard deviation of 29 pounds. 30 men were asked their weight and the mean was calculated to be 181, test the hypothesis that the mean is not 172 pounds using alpha = .05.
A normal distribution has a mean of 50 and a standard deviation of 4. Compute the probability of a value between 44.0 and 55.0. Compute the probability of a value greater than 55.0.
A national Retail Foundation survey found housholds intended to spend an average of $932 during the December holiday season. Assume that the survey included 850 households and that the standard deviation of the sample is $215.
Calculate the estimated standardized regression coeffcients using the output obtained here and the descriptive statistics output obtained above. Do your results agree with your previous results?
Recognize independent variable and dependent variable for this experiment. Think in your head what influences what? Or, what causes what? Cause is independent variable.
Develop 3 regression models to forecast selling price based upon each of other factors individually. Which of these is best?
The standard deviation of the population of completion times is minutes, what is the minimum sample size needed for the managers to be confident that their estimate is within minutes of?
In 2001, an estimated 78% of executives believed that age bias was a serious problem. In a 2004, 82% of the executives surveyed considered age bias a serious problem.
It would like to be within plus or minus $55 of the true mean with a 95% confidence level. The standard deviation is thought to be $700. How many card holders should be sampled?
the department of natural resources reports that a fish is unsafe to eat if the polychlorinated biphenol pcb
a local real estate investor in orlando is considering five alternative investments a day spa a theater a restaurant a
A population with u=73 and o=9 is transformed into a new population with u=10 and o=2. What is the new value for each of the following scores in the population?
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