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The United States Postal Service reports that 95 percent of first class mail within the same city is delivered within two days of the time of mailing. Six of the letters are randomly sent to different locations.
What is the probability that all six arrive within two days
What is the probability that exactly five arrive within two days
Find the mean number of letters that will arrive within two days
Compute the variance and standard deviation of the number that will arrive within two days.
Test the following claim about the difference between 2 populations proportions p1 and p2 for the given level of significance a and given sample statistic. Is it right-tailed, left-tailed, two-tailed. Assume the sample statistic are from independe..
what are the probability of you having the disease?
Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits?
Assume a customer has a two-attribute value function for cars: cost and quality. Cost can range from $5,000 to $10,000 and quality can range from 0 to 10 (a higher score is better).
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
If 15 golfers have checked in using this process, what is the expected number and standard deviation of no-shows among these golfers? (Show computations)
Determine the mean and standard deviation of following probability distribution.
The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience.
The mean weight of newborn babies in a Long Island Community is 7.5 lbs with a standard deviation of 1.4 lbs. What is the probability that a random sample of 49 babies has a sample mean weight of at least 7.2lbs?
Based on this sample information, create a 90% confidence interval for population mean yearly premium.
How many samples would be needed to create a 99 percent confidence interval that is within 0.02 of true proportion of premium grade fuel-quality failures.
The odds ratio between treatments (A, B) and outcome (death, survival) equals 2.0. What do you think about the following interpretation: "The probability of death with treatment A is twice that with treatment B". If you think, the above interpreta..
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