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10% of students in a university are dissatisfied with the services at their cafe. 10 students were selected randomly and were asked to fill out surveys.
(a) In this group of 10 students, what is the mean and variance of the number that were dissatisfied?
(b) If, instead, 55% of the students were dissatisfied, what is the probability that at least half of the 10 would be dissatisfied?
(c) If 55% of the students were dissatisfied and 200 were selected randomly, what is the probability that at least half would be dissatisfied? Can this problem be done using the Normal Distribution? Why? If yes, solve it using the Normal Distribution.
Calculate the Pearson correlation for these data also determine whether there is a significant correlation among attitudes for husbands also wives.
Using the original data, estimate the population standard deviation with 90% probability.
What is the probability that a new cup will overflow when filled by the automatic dispenser? At what value should the mean amount dispensed by the machine be set to satisfy this wish?
A four-year financial project is forecast to have net cash inflows of $20,000; $25,000; $30,000; and $50,000 in the next four years. It will cost $75,000 to implement the project
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
How large a sample should you take if you want to be 95% confident of the results and you want the error of the confidence interval to be no more than .05?
A standard for full credibility of 1,000 claims has been selected so that the actual pure premium will be within 10% of the expected pure premium 95% of the time. The number of claims has the Poisson distribution. Determine the coeffcient of vari..
At 5% level of significance, is true mean smaller than specification? Clearly mention your hypotheses and decision rule.
Is there sufficient evidence for concluding that true average repair time exceeds 200 min? Carry out a test of hypotheses using a significance level of .05.
What is the probability that none of three randomly selected persons is allergic to this drug? Assume that all three persons are independent.
Following is based on information from Statistical abstract of the United States, Dec, 1992. Are A and B mutually exclusive?
The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness. Records indicate that the mean shelf life of a 5-gallon jug of chlorine is 2,10 hours (90 days).
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