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An item increases in value from 240 to 280 in one year. What is the percentage change in the value of this item? Compute the percentage change in real terms if overall prices have increased by 5% for the same period.
Bird colonies. Suppose (this is too simple to be realistic) that the number y of new birds that join a colony this year has the same straight-line relationship with the percent x1 of returning birds in colonies of two different bird species.
Let U1 and U2 be independent random variables. Suppose that U1 is χ2 with ν1 degrees of freedom while U = U1 + U2 is chi-square with ν degrees of freedom, where ν > ν1. Then prove that U2 is chi-square random variable with ν - ν1 degrees of freedom.
for a normal distribution curve with a mean of 17 and a standard deviation of 5 which range of the variable defines an
find the value of t for the difference between two means based on an assumption of normality and this information about
according to a hospital administrator historical records over the past 10 years have shown that 20 percent of the major
Suppose the mean cannot be adjusted but the standard deviation can be reduced. What maximum value of the standard deviation would make 90% of the parts acceptable to the consumer? (Assume the mean to be 1.012)
I'm trying to determine what happens to the sample size if the level of confidence is reduced from 95% to 90% but the allowable error and the standard deviation remain
fifty people in the civilian labor force are randomly selected and the sample average age is computed to be 36.4.a find
Customers arrive at a service facility according to a Poisson process with rate λ. The (only) server is able to serve up to two customers at a time. However, an arbitrary customer is not served immediately if the server is busy upon his arrival.
In a non instanteneous receipt model, daily demand is 55 units and daily production is 120 units, Co=$70 and Cc=$4 per unit per year. What is the maximum inventory level?
You are dealt one card from a 52-card deck. Find the probability that you are not dealt a king. You are dealt one card from a 52-card deck. Find the probability that you are dealt a king or a red card.
Assume that the times spent per week playing with their children by all alcoholic and all nonalcoholic fathers both are normally distributed with equal.
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