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The average price of homes sold in the medium size city in Canada in the past year was $220,000. A random sample of 81 homes sold this year showed an average price of $210,000 with a sample standard deviation of $36,000. We wish to determine if there has been a significant decrease in the average price of homes.
Two student groups of 40 students each scored, respectively, between 45% to 85% (first group) and 55% to 90% (second group) on the test. A paper is randomly chosen from the two groups and shows the score of 78%. What is the probability that the pa..
If the population standard deviation is known to be 7.5 hours, can we conclude at the 5% significance level that he is right?
Industry standards suggest that 13 percent of new vehicles require warranty service within the first year. Compute the mean and standard deviation of this probability distribution.
A dairy farmer complained of a high frequency of abortion in his herd. As part of the effort to investigate the possible causes of the problem, serum samples were obtained from 90 adult cows randomly selected from all 400 present in the herd and s..
Consider the following two plots, which show normal and half-normal plots of the effects from an unreplicated 25factorial design. The effects are numbered starting with A as 1 and are in standard order. What would you conclude?
two cards are drawn from a well-shuffled deck.a what is the probability that they form a blackjack i.e. one is an ace
Using the six-step critical value approach, at the 0.05 level of significance, is there evidence that the population mean delivery time has been reduced below the previous population mean value of 20 minutes?
let n be the set of positive integers and for each n ? nan x x is a multiple of na 5 find r such that ar a3 a5 .b 5
Describe the meaning of alternatives, criteria and states of nature. How are they utilized in decision analysis?
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?
A contract provides for a benefit of 1 at time 10 provided that failure occurs before time 10. You are given that v(10) = 0.6. Find the expectation and variance of the present value of the benefits.
Suppose you study a random sample of 100 GRE verbal exams. Consider your a sketch of the sampling distribution of sample means and the appropriate calculation model.
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