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Total sales of cranes in a month is modelled as Normal with a mean of 12.6 and a standard deviation of 2. What is the probability of sales between 10 and 15 cranes?
a sample of 25 novels has a standard deviation of 9 pages. find the 95 confidence interval of the population standard
Suppose a sample of 300 men and women 16 years of age or older is selected randomly from the population. What is the probability that the sample proportion of those who do volunteer work is between 18% and 25%?
which the city believes might indicate that someone is wasting water. Would a bill that size be considered unusual?
a population consists of 45 items 35 of which are defective. in a sample of 4 items what is the probability that
Vehicle color preferences differ in different regions. Here are data on the most popular colors in 2011 for several different regions of the world:
The mean and standard deviation of a random variable x are 4 and 2 respectively. Find the mean and standard deviation of the given random variables:
You are asked to test the CFO's claim by examining monthly profits from the sample mega stores using the Z-test. State the decision rule using α = 0.05 significance level?
Calculation of Probability of Increase in Stock Price of a company
What is the probability of finding a data point between - 1 standard deviation and 2 standard deviations?
Six male and six female dancers perform the Virginia reel. This dance requires that they form a line consisting of six male/female pairs.
Under the assumption that a simple random sample of 1000 business travelers were surveyed, construct and interpret the 90% and 95% confidence intervals for the proportion of business travelers who use their hotel's exercise facilities.
In a latin square experiment, with 4 different golf-ball designs (A,B,C and D); if we suppose that A is the standard golf-ball design and the other three designs are newly developed. Which statistical method must we use to compare the three new d..
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