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Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean u=222 days and standard deviation o=13 days. What is the probability that a randomly selected pregnancy lasts less than 218 days?
Would it be reasonable to conclude that the population mean is 63 pounds?
A random sample of five observations from the first sample resulted in a standard deviation of (12). A random sample of seven observations from the second sample gave a standard deviation of (7) at the (.01) significance level.
One variable recorded is the count X of finish defects (dimples, ripples, etc) in the car's paint. Is it reasonable to use a binomial distribution?
The frequency distribution below was constructed from data collected from a group of 25 students. Construct a relative frequency distribution.
If the 95% confidence interval for the mean of a variable of interest obtained from a sample for values contains a hypothesized value, µ1, of the mean.
Test the hypothesis that the machines are showing difference qualities of performance. Use 5 per cent level of significance.
The market model relating the rate of return of stock XYZ (denoted RXYZ) to the rate of return Of a broader index of the stock market (denoted RM) is reported as:
In a recent study 90 percent of the homes in the United States were found to have largescreen TVs. In a sample of nine homes, what is the probability that:
He will then compare the season batting averages of group A (those with ballet training) and group B (those without ballet training) by comparing the mean of group A with the mean of group B.
Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of def..
The length of a particular telemarketing phone call has an exponential distribution with a mean equal to 1.5 minutes. Find the probability that the length of a randomly selected call will be between 30 - 50 minutes and 1 minuter or longer.
Assume that the histogram of the data is approximately bell-shaped. Approximately how many of the 260 students had sleep times between 355 minutes and 455 minutes per night?
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