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A nursing program gives a qualifying exam to students applying for admission. The grades on the exam have a mean score of 80 with a standard deviation of 6. Describe as completely as possible the distribution of grades.
The lifetimes of an appliance are normally distributed with a mean of 4.3 years and a standard deviation of .45 years. Describe as completely as possible the distribution of lifetimes for this appliance.
We conclude that memory of food intake in the distant past is fair to poor." Explain to your audience why r=0.217 points to this conclusion.
If the manufacturer wants to keep the mean at 12.8 ounces but adjust the standard deviation so that only 2% of the bags weigh less than 12 ounces, how small must that standard deviation be?
hat is sampling error? Could the value of the sampling error be zero? If it were zero, what would this mean? List the reasons for sampling. Give an example of each reason for sampling.
A researcher wants to see whether the stress of final exams elevates the blood pressure of freshman women. When they are not under any unusual stress, healthy 18 year olds have a systolic blood pressure that averages mean of 120 mm Hg with a stand..
Suppose 91% of all Australian households having a fax machine have a personal computer. A Australian household is randomly selected. What is the probability that the household has a fax machine and a personal computer?
The normal serum hemocrit level is 0.41 milligrams to 100 milligrams of blood. The level in elderly patients is significantly low at 0.31.
Develop the opportunitiy loss table and compute the expected opportunity loss for each product. Determine how much the firm would be willing to pay to a market research firm to gain better information about future market conditions.
A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 12.7 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
In case of fire, the probability that D1 operates correctly is 0.95 and the probabilty that D2 operates correctly is 0.92. Find the probability that the sprinkler system will come on.
A local hardware store claims that the mean waiting time in line is less than 3.5 minutes. A random sample of 20 customers has a mean of 3.7 minutes with a standard deviation of 0.8 minute. If α = 0.05, test the store's claim.
The quality control director for a clothing manufacturer wants to study the effect of operators and machines on the breaking strength (in pounds) of wool serge material. Is there an interaction between operator and machine?
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