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If you have a normal distribution of a random variable x, with a mean of 56 and standard deviation of 8: What is the probability that the random variable x will be within plus or minus 1 standard deviation of the mean?
Find the indicated probability using the geometric or Poisson distribution. A newspaper finds that the mean number of typographical errors per page is nine.
A fastener manufacturing company uses a chi-square goodness of fit test to determine if a population of all lengths of ¼ inch bolts it manufactures is distributed according to a normal distribution.
Select a second sampling technique for the same hypothesis and give a second detailed design of how you would gather sampling data.
Scores are normally distributed with a mean of 460 and standard deviation of 80. The top 2.5 percent of the applicants would have a score of at least.
The Court of Appeals erred in stating that petitioners'regression analyses were "unacceptable as evidence of discrimination", because they did not include all measurable variables thought to have an effect on salary level.
A neurologist wants to detect whether the mean response time for drug-injected rats differs from a control group not injected. The control group has the mean response time of 1.2 seconds.
The trend line y = 0.70 + 0.005t was calculated from quarterly data for 1999 -2003, where t = 1 for the first quarter of 1999. The seasonal indexes computed from the trend line for the four quarters of the year 2004 were .85, 1.05, 1.15, and .80, ..
What standard deviation (within 0.001 inch) minimizes the annual cost of producuign elevator rails. You do not need to try standard deviations in excess of 0.02 inches.
A salesperson contacts eight potential customers per day. From past experience, we know that the probability of a potential customer making a purchase is .10. What is the probability the salesperson will make exactly two sales in a day?
only 3 reported that their health was excellent. Find the probability that when 13 adults are randomly selected, 3 or fewer are in excellent health.
What level of confidence is associated with an interval of .400513 to .515487 for the long run proportion of new product placements?
Probability of selecting a row with that number of seeds germinating. Determine the standard deviation of the number of seeds per row that germinated.
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