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Weakly earnings on a certain import venture are approximately normally distributed with a known mean of 219 and unknown standard deviation. If the proportion of earnings over 291 is 0.155, find the standard deviation.
Scores by women on the SAT-I test are normally distributed with a mean score of 998 and a standard deviation of 202. scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6 assume the two tests ..
Two chi-square distributions were plotted on the same chart. One distribution was for 3 degrees of freedom and the other was for 12 degrees of freedom. Which distribution would tend to approach a normal distribution?
Suppose that in fact 8% of the apples on the truck do not meet the standards. What is the probability that the shipment will be accepted anyway?
A couple both carry a recessive gene for albinism, meaning the probability of any child being albino is ¼. The couple plans to have 4 children. What is the probability that two of their four children will be albino? Calculate the expected mean and ex..
A sample of 16 patients in a doctors office showed that they had to wait an average of 43 minutes with a standard deviation of 8 minutes before they could see doctor. Provide a 99% confidence interval for the average waiting time for all of the pa..
However, if they lose the first contract, the president thinks that the probability of winning the second contract decreases to 48%. What is the probability that they win both contracts?
We are interested in determining if the accident proportions differ between the two age groups:
Distribution with the mean of 10,000 hours. Component has already been in operation for its mean life. Determine the probability that it will fail by 15,000 hours?
a recent national study about the effectiveness of echinacea in cold treatments was performed by a medical school in
Furthermore, assume that the standard deviation of the population is $0.14. The value of the test statistic for this hypothesis test and the p-value respectively are?
If random sample of size n = 16 are selected, can we say anything about the xbar distribution of sample means?
QUESTIONS #36 THROUGH #40 REFER TO THE FOLLOWING:A professor wants to analyze the number of hours students spent online during the weekend and their scores on a test the following Monday. Part of the regression output appears below.
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