Estimating population standard deviation
For a population with a mean of µ =70, a score of X = 62 corresponds to z = -2.00. What is the population standard deviation?
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Using the 0.05 level of significance, is there evidence that the population mean has changed from 41.4 days?
Find the mean of the given probability distribution. The random variable x is the number of houses sold by a realtor in a single month at the sendsom's real estate office.
Shade the area that represents the proportion and find the proportion
A distribution with a mean of µ = 62 and a standard deviation of s= 8 is transformed into a standardized distribution with µ= 100 and s= 20. Find the new, standardized score for each of the following values from the original population
A 13 m ladder whose weight is 249 N is placed against a smooth vertical wall. A person whose weight is 959 N stands on the ladder a distance 1.2 m up the ladder.The foot of the ladder rests on the ?oor 9.23 m from the wall.Calculate the force exerted
Let X~N(1.3,2) the proportion and find the proportion
Assume that adults have IQ scores that are normally distributed with a mean of u=105 and a standard deviation o=15. Find the percentage of adults that have an IQ between 94 and 116.
Consider a null hypothesis that a new, unapproved drug is unsafe and an alternative hypothesis that a new, unapproved drug is safe. (a) Explain the risks of committing a type I or Type II error.
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