A simple random sample is to be taken of 527 business majors in a college to estimate the proportion favoring greater emphasis on business ethics in the curriculum. How many observations are necessary to ensure that a 95% confidence interval for the population proportion extends at most 0.06 on each side of the sample proportion?
Answer to relevant QuestionsShow algebraically that Equation 7.23 is equal to Equation 7.24. That is, It is known that the standard deviation in the volumes of 20-ounce (591-millliliter) bottles of natural spring water bottled by a particular company is 5 millliliters. One hundred bottles are randomly sampled and ...Find the LCL and UCL for each of the following. a. α = 0.05; n = 25; x-bar = 560; s = 45 b. α/2 = 0.05; n = 9; x-bar = 160; s2 = 36 c. 1 - α = 0.98; n = 22; x-bar = 58; s = 15 A business school placement director wants to estimate the mean annual salaries 5 years after students graduate. A random sample of 25 such graduates found a sample mean of $42,740 and a sample standard deviation of $4,780. ...Consider again the Mendez Mortgage Company case study in Chapter 2. From a random sample of n = 350 accounts of the company's total portfolio, estimate with 95% confidence the proportion of all the company's accounts in ...
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