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Question: In a survey of a very large population, the incidences of two health problems are to be estimated from the same sample. It is expected that the first problem will affect about 3% of the population and the second about 40%. Ignore the finite population correction in answering the following questions.
a. How large should the sample be in order for the standard errors of both estimates to be less than .01? What are the actual standard errors for this sample size?
b. Suppose that instead of imposing the same limit on both standard errors, the investigator wants the standard error to be less than 10% of the true value in each case. What should the sample size be?
Construct a decision tree, and determine what style the designer should choose to maximize her expected pro?ts.
The table shows the average annual cost of high speed internet access in dollars for a random sample of individuals in four different regions of a state. Northern Southern Eastern Western 125 145 162 171 130 120 158 168 115 140 145 187 124 138 143..
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An article in the magazine Science (Service, 1994) discussed a study comparing the health of 6000 vegetarians and a similar number of their friends.
Checking the output by almost continuous sampling since the abnormal condition began. What is the probability that in a sample of 10 pieces: Exactly 5 will be defective?
What was written by Hamilton and, Jay, and, Madison encouraging the ratification of the constitution?
A random sample of 81 credit sales in a department store showed an average sale of $68.00. Historically, it is known that the standard deviation of the population is $27.00.
Find a newspaper or magazine article in which some data are reported. For the data discussed in the article, answer the questions above. Include a copy of the article with your report.
Design the circuit with inputs Xa , X b , X c , and Xd , reset L, clock C, and output U. Use a 1-hot code for the state assignment. Implement the circuit with D flip-flops and AND gates, OR gates, and inverters.
What percentage of each level of degree is earned by women? Write a brief description of what the data show about the relationship between gender and degree.
Let X be a random variable with density function fX , and let Y = X + b, Z = aX, and W = aX + b, where a /= 0. Find the density functions fY , fZ , and fW.
The population standard deviation is σ2 = 7. Test that the population means differ using a 1% significance level.
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