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An agricultural researcher plants 25 plots with a new variety of corn that is drought resistant and hence potentially more profitable. The average yield for these plots is x = 150 bushels per acre. Assume that the yield per acre for the new variety of corn follows a normal distribution with unknown mean ? and that a 95% confidence interval for ? is found to be 150 ± 3.29. Which of the following is true?
A) A test of the hypotheses H0: ? = 150, Ha: ? ? 150 would be rejected at the 0.05 level.
B) A test of the hypotheses H0: ? = 150, Ha: ? > 150 would be rejected at the 0.05 level.
C) A test of the hypotheses H0: ? = 160, Ha: ? ? 160 would be rejected at the 0.05 level.
D) All the above.
(a) Set up a 99% confidence interval estimate of the true population average amount of paint included in a five-litre can. (Use the z-table.) (b) Based on the results of (a), do you think that the store owner has a right to complain to the manufact..
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A random sample of 64 light bulbs indicates a sample mean life of 350 hours. At the 0.05 level of significance, is there evidence that the mean life is different from 375 hours?
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If standard deviation is 50 hours and α is equal to 0.01, what values for mean x will result in rejection of null hypothesis.
Standard Normal Distribution Table
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At the .01 significance level, is there a relationship between job pressure and age?
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