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which_inference(1) - tax forms The IRS suspects that one...

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Which inference? Which type of inference procedure is called for in each? One Proportion, Two sample means, Two proportions, Matched pairs, One mean, Regression, Will you use z , t ? How many degrees of freedom (if appropriate)? 2. Cheating. A teacher believes that no more than 10% of high school students ever cheat on an exam, but a confidential survey found that 14 of 88 randomly selected students admitted having cheated at least once. Is this strong evidence that the teacher was wrong? 3. Cigarettes. Some of the cigarettes sold in the US claim to be “low tar”. How much less tar would a smoker get by smoking low tar brands instead of regular cigarettes? Samples of 15 brands of each type were randomly chosen from the 1206 varieties (no kidding) on the market. Researchers measured the tar content (mg/cig) for each brand, hoping to estimate the difference between regular and low tar brands. 5. Taxes. Waiters are expected to keep track of their income from tips and report it on their income
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Unformatted text preview: tax forms. The IRS suspects that one waiter has been under-reporting his income, so an IRS agent goes through the restaurant’s Fles and obtains a random sample of 20 credit card receipts from people this waiter served. The agent is looking for evidence that his tips averaged more than he claimed on his tax return. 7. Scoring. A football fan wonders if there is any evidence of a home Feld advantage when it comes to scoring. His data are the total number of points scored in home and away games by the 32 N²L teams last season (assumed to be representative of all seasons.) 8. Speeding. Among a random sample of college-age drivers 5% of the 576 men said they had been ticketed for speeding during the past year, compared to only 3% of the 552 women. Does this indicate a signiFcant di±erence between college males and females in terms of being ticketed for speeding? 1...
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