1) A company conducts a random sample of orders to estimate the proportion of orders which arrive in their expected delivery window. The 95% confidence interval is (0.881, 0.923). What is the point estimate? a) 89.9% b) 90% c) 90.1% d) 90.2% e) 90.3% 2) Given . . . Confidence Interval: (0.881, 0.923) & Point Estimate: 0.902. What is the margin of error? a) +/- 2% b) +/- 2.1% c) +/- 21% d) +/- 1.2% e) +/- 2.01% 3) A polling firm wants to estimate what proportion of voters plan on voting for a certain candidate. They would like the margin of error to be 3% with 95% confidence. Since they do not have a previous sample proportion to use in their calculations, they will use the conservative p ̂ of 0.50. Estimate the sample size required to obtain the desired margin of error. a) 65 people b) 107 people c) 1,068 people d) 16 people e) 10,684 people 4) Cameron uses a critical value z* = 1.44 to estimate a confidence interval. What confidence level did he use? a) 87.5% b) 85% c) 89% d) 90% e) 92.5% 5) Who sat on a wall before having a great fall? a) Little Miss Muffett b) Little Bo-Peep c) Mother Goose d) Old King Cole e) Humpty Dumpty

Confidence Intervals Problem Solving

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