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The probability that a student passes a written test for a private pilot's license is 0.75. What is the probability that a student will fail the test on the first attempt and pass it on the second attempt?
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below.
Many companies use sampling to determine whether a batch should be accepted. A (n, c) sampling plan consists of inspecting n randomly selected items from a batch and accepting the batch if c or fewer sampled items are defective.
Although Bob raised the price to $1.75, sales of quarter-pound burgers rose to 8,200. Explain why this does not represent a violation of the law of demand.
CD Camera produces a new camera that it claims can take an average of more than 7 photographs per second. A test of 36 randomly selected cameras yielded the following sample values:
To test whether there is significant mean difference between two groups using independent sample t test.
Group 2 data [ 141, 139, 172, 131, 150, 125. Assume normal distribution, with equal variance in the two groups and conclusion for a=0.05.
Random sample of five North American adult is more than 7 hours a day? What is the probability that in random sample of 5 north American adults, all watch television more than 7 hours a day?
Find the probability of a Type II error if in fact the mean waiting time is actually 9.8 minutes.
If this poll had been based instead on 5000 adults, do you think the "95% confidence interval" would be wider or narrower than the interval given?
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
Interpret the estimated tolerance intervals and the confidence interval in the context of the situation related to the exercise.
Wwith standard deviation of 3.8 miles. Find a 99% confidence interval for the population mean number of weekly miles denise runs.
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