9) A researcher wishes to estimate, with 95% confidence, the population proportion of students who did...
9) A researcher wishes to estimate, with 95% confidence, the
population proportion of students who did not change their major.
Her estimate must be accurate within 2.5% of the true
proportion.
a) What is the minimum sample size needed assuming that no prior
information is available?
b) What is the minimum sample size needed using a prior study that
found that 34% of the students did not change their major?
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9) A researcher wishes to estimate, with 95% confidence, the
population proportion of students who did...
A researcher wishes to estimate with 95% confidence, the population proportion of adults who think the...
A researcher wishes to estimate with 95% confidence, the population proportion of adults who think the president of heir country can control the price of gasoline. Her estimate must be accurate w in 4% of the true proportion. a) No preliminary estimate is available. Find the minimum sample sze needed b) Find the minimum sample size needed, using a prior study that found that 34% of the respondents said they think their president can control the price of gasoline. c)...
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who support labeling...
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A researcher wishes to estimate, with 95% confidence, the population proportion of adults who support labeling legislation for genetically modified organisms (GMOs). Her estimate must be accurate within 4% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 79% of the respondents said they support labeling legislation for GMOs. (c) Compare the results from parts (a) and (b). (a)...
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