Difference between internal and external validity
What is the difference between internal and external validity? My textbook defines them but it is very vague.
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The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (d) Neither will fail? (c) One or the other will fail? Show all steps carefully.
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Thirty- five percent of adult Americans are regular voters. A random sample of 250 adults in a medium size college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidenc
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