A recent study asked a random sample of 527 college-age adults (18–24 years old) about their plans for purchasing a new computer. Of the sample, 105 said that they planned to purchase a Mac computer within the next year. Construct and interpret a 95% confidence interval for the proportion of all college-age adults who plan to purchase a Mac computer within the next year.
STATE: (what are you looking for)
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PLAN: (identify your method and check the conditions)
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DO: (calculate the interval)
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CONCLUDE: (Interpret the interval)
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Abbie wonders about college plans for all the students at her large high school (over 3000 students). Specifically, she wants to know the proportion of students who are planning to go to college. Abbie wants her estimate to be within 5 percentage points (0.05) of the true proportion at a 90% confidence level. How many students should she randomly select?
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STATE
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PLAN
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DO (Your calculator expects a whole number of X. It is OK to round)
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CONCLUDE
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PLAN
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DO
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CONCLUDE
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After checking your answers in the back, are there any questions from above that you are still confused about? I'll try to go over questions that many people select below. If I don't go over it in class, I'm happy to talk to you about it during office hours.
The numbers below correspond to the Formative question numbers