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An instructor believes that 20% or less of the students who finish a statistics course gat an "A" grade. A sample of 100 students was taken. 24 of the students in the sample received an "A". Test the instructor's claim at a 5% level of significance. What is your conclusion?
The following data on annual rates of return were collected from five stocks listed on the New York Stock Exchange ("the big board") and five stocks listed on NASDAQ.
The manager requires the estimate to be within 1.0 minutes of the population value. What sample size is needed?
What are the mean and the standard deviation of the number of firms that purchase a Unix machine from Sun Microsystems?
Incomes in the thousands of dollars were sampled in one region, they are as follows (1.5, 3.0, 4.2, 5.6, 2.6, 4.1, 0.9, 5.7, 5.4, 2.6) Assume the population is normal.
What I need are relevant questions for a survey questionnaire that will be valid for testing each of 3 hypotheses. Include the variables tested.
Would you be willing to provide an example of both methods (step by step) described in your document for determining the forecast based upon the two different methods. Maybe just for one single city.
To determine the efficiency of the current ticket operation, Mike wishes to examine several queue operating characteristics.
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
Participants is approximately a normal distribution with a mean of 68 years and a standard deviation for 3.5 years. What proportion of the plan recipents die before they reach the standard retirement age of 65.
Write three quadratic equations within a, b, c (coefficients of x^2, x and the constant as 1 integers, 2 rational, 3 irrational numbers).
A wholesaler assures retailer replacement times for TVs normally dist. with mean of 8.2 and s.d. of 1.1. The retailer finds that a random sample of 20 sets from the wholesaler have mean replacement time of 7.6 years.
What should ING's General Counsel do to minimize ING's expected costs?
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