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Fifty samples of size 600 were drawn from a manufacturing process and the number of defectives in each sample was counted. The mean sample proportion was 0.025. The lower control limit for the 3-sigma p chart is
Set up hypothesis and two-tailed decision rule for right mean using 5% level of significance. Hypothesis for a two-tailed decision is?
Follow the conventions as described in the general guidelines for writing up Special Problems.
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
She knows that 60% of the minerals have mass less than a certain amount m, and needs to select a random sample of n = 16 specimens for an experiment. With what probability will their average mass be less than the same amount m? (Hint: Calculate th..
Create ADM/PERT diagram. Determine the critical path.
Elucidate this data use an appropriate statistical test to explain whether the population mean TV "on" time has declined in the past decade.
Let X be the number of yes votes obtained from a random sample of 200 out of the entire voting population. What is the expected value of X if, in fact, 65% of all voters supported the dictator?
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that:
If the average tax payer who makes $140,000 per year owes the government $18,200 with a standard deviation of $1500, and the IRS receives a 1040 tax documents from a customer who earned $140,000 that claims he only owes $12,000, should the IRS sus..
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
A random sample of n = 16 scores is selected from a normal distribution with a mean of μ = 50 and standard deviation of σ = 10. a) What is the probability that the sample mean will have a value between 45 and 55?
Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households selected at random, what is the probability that:
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