Reference no: EM131008430
1. Economy. In 2008, a Gallup Poll asked 2336 U.S. adults, aged 18 or over, how they rated economic conditions. In a poll conducted from January 27 through February 1, 2008,
a) Does your confidence interval provide evidence to support the claim.
b) What is the significance level of the test in b? Explain.
2. Convenient alpha. An enthusiastic junior executive has run a test of his new marketing program. He reports that it resulted in a "significant" increase in sales. A footnote on his report explains that he used an alpha level of 7.2% for his test. Presumably, he performed a hypothesis test against the null hypothesis of no change in sales.
a) If instead he had used an alpha level of 5%, is it more or less likely that he would have rejected his null hypothesis? Explain.
b) If he chose the alpha level 7.2% so that he could claim statistical significance, explain why this is not an ethical use of statistics.
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Write appropriate hypotheses
: The average age of online consumers a few years ago was 23.3 years. As older individuals gain con- fidence with the Internet, it is believed that the average age has increased. We would like to test this belief.
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Footnote disclosures that would be necessary
: Manner of reporting the change under current generally accepted accounting principles including a discussion, where applicable, of how amounts are computed.
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Null hypothesis of increased sleepwalking
: The manufacturer of a new sleeping pill suspects that it may increase the risk of sleepwalking, which could be dangerous. A test of the drug fails to reject the null hypothesis of increased sleepwalking when tested at alpha = .01.
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How many mechanics would be at the counter
: How many mechanics would be at the counter, including being served and what probability that a mechanic would have to wait for service?
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Confidence interval provide evidence to support the claim
: 1. Economy. In 2008, a Gallup Poll asked 2336 U.S. adults, aged 18 or over, how they rated economic conditions. In a poll conducted from January 27 through February 1, 2008, a) Does your confidence interval provide evidence to support the claim.
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Describe how professor ivy family heights are distributed
: Professor Ivy decides to compare her families' heights to the heights of her husband's family and is able to model this with the 2 normal curves below. Her family is the dotted line. His is the solid.Describe how Professor Ivy's family heights are ..
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Increasingly hacker-intrusive network environment
: Question 1 : What features of this product line do you feel will be instrumental in deploying your network in this increasingly hacker-intrusive network environment?
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Few contemporary men judge
: In August 2004, Time magazine reported the results of a random telephone poll commissioned by the Spike network. Of the 1302 men who responded, only 39 said that their most important measure of success was their work.
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What''s the difference between encoding, encryption
: What's the difference between encoding, encryption, and hashing?
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