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Question: Ring-no-answer A common form of nonresponse in telephone surveys is "ring-no-answer." That is, a call is made to an active number but no one answers. The Italian National Statistical Institute looked at nonresponse to a government survey of households in Italy during the periods January 1 to Easter and July 1 to August 31. All calls were made between 7 and 10 p.m., but 21.4% gave "ring-no-answer" in one period versus 41.5% "ring-no-answer" in the other period. Which period do you think had the higher rate of no answers? Why? Explain why a high rate of nonresponse makes sample results less reliable.
suppose that any one of three mutually exclusive symptom states (B1, B2, and B3) may be associated with each of these diseases. Experience shows that the likelihood of P(Bi /Ai) having a given symptom state when the disease is present is as shown ..
Insurance policy from company A costs $300 a year but guarantees to replace any losses due to theft. Create the decision tree.
In business, investors are always interested in the tradeoff between returns and risk. Regression analysis is a statistical technique that can be used to quantify this risk.
An aged merchant of Baghdad was much respected by all who knew him. He had three sons, and it was a rule of his life to treat them equally. Whenever one son received a present, the other two each received a present of equal value.
A sample of 200 college students resulted in the numbers below. At "alpha" = 0.05, can we conclude that opinions of college students differ from those in the national survey of adults?
A sample survey at a supermarket showed that 204 of 300 shoppers regularly use coupons. Use the large sample confidence-interval formula of Theorem 6 to construct a 95% confidence interval for the corresponding true proportion.
researchers investigated the issue of race and equality of access to clinical trials. the table below shows the
If the claim says that the population mean is greater than 200 and the sample mean is 215, we can say that the claim is true even without a formal test.
Assume that a random variable, x, is distributed according to a normal distribution with mean 12 and standard deviation 2. Find the z-value if:
It is known that a certain prescription drug produces undesirable side effects in 20% of all patients who use it. Among a random sample of nine patients using the drug, find the probability of each event
For the Japanese female face, y¯ = 10.2% and s = 31.3%. The researchers used this sample information to test the null hypothesis of a mean level.
An article in Financial Analysts Journal discusses results of a regression analysis of average price per share P on the independent variable X/k.
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