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Replacement times for CD plater are nomally distrbuted with mean 7.1 years and standard deviation of 1.4years. a) fibd the probability that a randumly selected CD player will have a replacement time less than 8 years.b)If you want to provide a warranty so that only 2% of CD player will be replaced before the warranty expires, what is the tome length of the warranty? c) What is p67?
Using variables below, (1) mention all research questions that would be replied with a Two Way ANOVA test, (2) make null hypotheses for these questions.
A journal polled its readers to determine the proportion of wives who, if given a second chance, would marry their husband again.
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
Choose the correct conclusion regarding the claim that the weights of statistics text vary more than the weights of text in general.
Age effects in medical care. The type of medical care a patient receives may vary with the age of the patient. A large study of women who had a breast lump investigated whether or not each woman received a mammogram and a biopsy when the lump was ..
Supposes that the diameter of bearings are independent normally distributed random variables with mean µB = 1.005cm and variance σ²B = (0.003)² cm² . The diameter of shafts are independent normally distributed random variables having mean µB = 0.9..
At the 0.01 level, is the bank loan financially sound (should the bank ask for additional collateral)? What is the decision rule?
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What is the value of your test statistic.
In the context of hypothesis testing regarding one mean, the test (Z or t) may be statistically significant at the 5% level, but not significant in a practical sense at all. Illustrate the meaning of this statement by citing 3 examples from any ar..
Suppose 91% of all Australian households having a fax machine have a personal computer. A Australian household is randomly selected. What is the probability that the household has a fax machine and a personal computer?
The U.S. government recently reported that the proportion of people feeling negative about the economy was only 30%. However, a recent poll by CNN/Gallup found that in a sample of 1000 people 450 of them felt negative about the economy.
Whether regression can be used to estimate the Demand from other data in the file. So that Howies can determine the daily supply in a more cost effective way.
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