The neighborhood dry cleaner wants to estimate the proportion of all purchases that are paid in...
The neighborhood dry cleaner wants to estimate the proportion of all purchases that are paid in cash.
If they want their estimate to be within 0.03 with 95% confidence, how many receipts would they need to sample if:
1. We have no previous information.
2. Previous samples have never given a sample proportion higher than 0.35.
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The neighborhood dry cleaner wants to estimate the proportion of
all purchases that are paid in...
A public health major wants to estimate the proportion of students that watch network news on...
A public health major wants to estimate the proportion of students that watch network news on a regular basis. She has no previous knowledge and doesn't want to guess about this proportion. Assuming the worst-case-scenario, how large of a random sample (n) does she need to take if she wants the estimate to be within 0.07 of the true population value with 90% confidence? On=138 On=139 but 40 should be used On=139 On=138 but 40 should be used
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a. Assume that a sample is used to estimate a population proportion p. Find the 95%...
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A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size...
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We want to estimate the proportion of students who have credit card debt more than $2,000. What size sample should be obtained if we want to estimate the proportion within 3%; that is, the margin of error is 3%, with 95% confidence. a) suppose a prior study indicates that the percentage is 30% b) suppose we use no prior estimate of the percentage.
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A public health major wants to estimate the proportion of students that watch network news on a regular basis. She has no previous knowledge and doesn't want to guess about this proportion. Assuming the worst-case-scenario, how large of a random sample (n) does she need to take if she wants the estimate to be within 0.07 of the true population value with 90% confidence? On=138 On=139 but 40 should be used On=139 On=138 but 40 should be used
Suppose the U.S. president wants an estimate of the proportion of the population who support his current policy toward revisions in the health care system. The president wants the estimate to be within 0.03 of the true proportion. Assume a 90% level of confidence. The president's political advisors estimated the proportion supporting the current policy to be 0.56. (Use z Distribution Table.) How large of a sample is required? (Round the z-values to 2 decimal places. Round up your answer...
UTVU 4. If a researcher wants to estimate a population proportion to be within 4 percentage points with a 95% confidence if she uses the estimate from a recent study that showed its value to be 85%, what size sample should she obtain?
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