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A sample of 800 computer chips revealed that 60% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature claimed that more than 57% do not fail in the first 1000 hours of their use. Is there sufficient evidence at the 0.02 level to support the company's claim?
State the null and alternative hypotheses for the above scenario.
What is the standard deviation of expected returns for Stock X? For Stock Y?
A project manager at COMSOFT corporation has collected statistics on the organization's software development process. He has the size of each project in number of lines of code for the past 20 projects and the number of lines of code in error disc..
If the operations are not independent, what effect will this have on the mean and standard deviation of completion time?
A PC manufacturer claims that no more than 2% of their machines are defective. In a random sample of 100 machines, it is found that 5% are defective. The manufacturer claims this is a fluke of the sample.
a paticle starts at 00 and moves in one-unit independed steps with equal probabilites of 14 in each of the four
From an appropriate statistical description of these data sets, comment on the indicated changes in the population in the two decades between 1960 and 1980.
1) What statistical procedure can be used? Explain why. 2) Use a = 0.05, and bothrejection region and p-value to make a decision.
M&M's. The Masterfoods company says that before the introduction of purple, yellow candies made up 20% of their plain M&M's, red another 20%, and orange, blue.
Define parameters and state the null and alternative hypotheses: In 2013, it is known that two-thirds (about 67%) of people aged 50-64 were on Facebook
What is a p-value? What is its role in hypothesis testing? How is it interpreted with regard to the outcome of the hypothesis test?
Tell what each of the residual plots below indicates about the appropriateness of the linear model that was fit to the data.
Perform a significant test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
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