(Or calculator work) Stat - Test - 1PropZInt
(Or calculator work) Stat - Test - 1PropZInt
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)
PLAN: (identify your method and check the conditions)
DO: (calculate the interval)
CONCLUDE: (Interpret the interval)
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?
STATE
PLAN
DO (Your calculator expects a whole number of X. It is OK to round)
CONCLUDE
STATE
PLAN
DO
CONCLUDE
Explain
Your answer should be around ~1800-2000 depending on how much you rounded.
Should be ~20-80 more
You answer should be around 400-500 depending on how much you rounded
Are there any problems above that you would like to go over in class? Indicate the question numbers below (Numbers refer to the Formative question number). I'll try to cover anything that is highly requested.
