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The mean age at which men in the United States marry for the first time follows the normal distribution with a mean of 24.6 years. The standard deviation of the distribution is 2.6 years. For a random sample of 57 men, what is the likelihood that the age at which they were married for the first time is less than 24.8 years? (Round z value to 2 decimal places. Round your answer to 4 decimal places.)
Point to at least two directional and nondirectional hypotheses you would like to test associating either to your current job or job you would like to do after graduation.
The number of vacation days taken by employees of a company is normally distributed with a mean of 14 days and a standard deviation of 3 days. For the next employee, what is the probability that the number of days of vacation taken is less than..
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
the most accurate statement about research articles in psychology is thata normal curves and probabilities are almost
Conduct a full test, at the 5% level of significance, to establish whether there is a statistically significant difference between the population mean times in the two banks. (Assume that the samples are drawn from populations that are approximately..
heights of 10 year old girls follow an approximately normal distribution with mean of 54.4 and a standard deviation of
can the value of the mean median or mode of a set of scores ever be negative?
suppose bolts are being manufactured using a process so that it is known that the length of the bolts follows a normal
Find the probability that the mean wieght of these 400 bags exceeds 16.6 ounces.
Normal distribution with a mean of 131 pounds and a standard deviation of 5.9574 pounds. What percent of the students would you expect to weigh at least 145 pounds?
a man claims to have extrasensory perception. as a test a fair coin is flipped 26 times and the man is asked to predict
What is the probability that of today's 1,100 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.
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