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An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. He believes that the mean income is $23.8, and the standard deviation is known to be $8.9. How large of a sample would be required in order to estimate the mean per capita income at the 98% level of confidence with an error of at most $0.31?
The accounting department at Western Materials Inc. national manufacturer of unattached garages, reports it takes two construction workers of a mean of 32 hours and standard deviation of 2 hours to erect Red Barn MODEL.
At the insistence of a government inspector, a new safety device is installed in an assembly-line operation. After the installation of this device, a random sample of 8 days' output gave the following results for numbers of finished components pr..
Find the value of the constant c in terms of L . -- Find the marginal PMFs, PM(m) and PN(n). - Find Pr(M+N
q1. the hours of study and the final exam grades have this type of relationshipy 7.35hours 34.62.based on this linear
Consider a normal population with µ = 25 and σ = 7.0. (A) Calculate the standard score for a value x of 23.
q1. a research shows that employee salaries at company xyx in thousands of dollars are given by the equation y-hat 48.5
These data were obtained in a comparison of two different methods for determining dissolved oxygen concentration (in milligrams per liter):
Market researchers would like to know if customers prefer a well-known brand over a generic brand of soft drink. They give a large sample of people the two drinks to taste in a random order and ask them which one tastes better.
Construct the 95% confidence interval for the proportion of students with at least one injury.
a study showed that 32 of all firms in county a are owned by women. you are phoning local businesses assuming that the
Compute the two weights that give the cutoff points for the three categories.
given a population with a mean m of 75 and a standard deviation of 15 what is the z-score for the following values?a.
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