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A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a person in Africa is selected at random, what is the probability that the person will die before the age of 65?
a. 94.52%
b. 82.89%
c. 94.95%
d. 88.49%
If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means:
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
Suppose that the average annual salary for the worker in United States is $39,000.00 and that the annual salaries for Americans are normally distributed with a standard deviation equal to $7,000.00.
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
Write the linear regression equation to forecast father's education from mother's education?
At 95% confidence, test to determine if more than 21% of the population will like the new soft drink.
Assume we have set of blood pressure with a mean of 80 Diastolic, and a sample standard deviation of 10 points. If we assume a normal distribution of Diastolic blood pressures,
Describe what you find then produce an ANOVA for the problem.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Which of the examples below represent the Ratio level of scaling?
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
If 16 out of 20 spins just came up black, determine the probability that next spin is going to be red?
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