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To speed up the process in a blood testing procedure, blood samples from 3 people are combined into one mixture. The mixture will only test negative if all the individual samples are negative. If the probability that an individual sample tests positive is 10%, what is the probability that a mixture of three will test positive?
The number of degrees of freedom corresponding to between treatments is:
Determine critical value for boundary of the rejection region (i.e., Zα).
An instructor claims the average time to take a statistics test is greater than 39 min. As, if a sample of 33 students took 43 min. is the instructor's claim true?
Consider a four digit uniform random number generator; as in each of the 10,000 values 0.0000 through 9999 is equally likely. Find the mean and variance of the values produced by such a random number generator.
To sketch the 3-sigma X-bar chart and R-chart parameters. A candy bar manufacturer desires to set up a variables control chart for the net weight of its candy bars.
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Complete hypothesis test using a 5% level for risk with directional research hypothesis.
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
Using one mean Z test to test whether or not to support the claim - Is there evidence that the average hours is below 6? Describe.
What is the optimal strategy for producing 500 tons of newsprint pulp, 600 tons of packaging pulp, and 300 tons of print stock quality pulp at minimum cost?
For which of given variables must a "two tail" t-test be applied?
Explain why we need to use the t distribution. What assumption do you need to make?
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