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The tensile strength of nonferrous pipes is of importance. Samples of size 5 are selected from the process output, and their tensile strength values are found. After 30 such samples, the process mean strength is estimated to be 3000 kg with a standard deviation of 50 kg.
(a) Find the 1σ and 2σ control limits. For the 1σ limits, what is the probability of concluding that the process is out of control when it is really in control?
(b) Find the 3σ limits.
(c) If Rules 1 and 2 are used simultaneously to detect out-of-control conditions, assuming independence, what is the overall probability of a type I error if 3σ control limits are used?
Develop a regression model that could be used to predict the final average in the course based on the first test grade. Predict the final average of a student who made an 83 on the first grade.
In a market study for Target, a researcher found that 70% of customers are repeat customers. If 14 customers are selected at random, find the probability of getting.
The firm does not pay any dividends. Sales are expected to increase by 10 percent next year. If all assets, short-term liabilities, and costs vary directly with sales, how much additional equity financing is required for next year?
an insurance company found that 2.5of male drivers between theages of 18 and25 are involved in serious accidents
A researcher hypothesizes that there will be a significant change in a student's fear of statistics following participation in an intervention designed to increase students' confidence in their ability to successfully complete a statistical course..
Suppose that the shut-down price is $10, What is the minimum quantity offered to the market by this firm? __ units
a technician monitors a group of five computers that run an automated manufacturing facility. it takes an average of 15
Heights of ten year old boys (5th graders) follow an approximate normal distribution with mean u=55.5 inches and standard deviation σ=2.7 inches:
mary had a foul shot average of 60 making 12 of 20 shots bill had a foul shot average of 50 making 5 of 10 shots in
In a large section of a statistics class, the points for the final exam are normally distributed with a mean of 72 and a standard deviation of 9. Find the lowest score on the final exam that would qualify a student for an A, a B and a C.
suppose iq score were obtained from a randomly selected siblings.for such 20 pairs of people the linear corelation is
What is the probability that a worker chosen at random will have an age greater than or equal to 30 and less than or equal to 39?
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