4. Ellie and Alec are each attempting to estimate the proportion of coffee drinkers who consume more than one cup of coffee per day. They each obtain a random sample of coffee drinkers, and, drink more than one cup of coffee per day is 0.40. Ellie and Alec each use their sample data to construct a confidence interval. Ellie's interval is from 0.286 to 0.514, and Alec's interval is from 0.346 to 0.474. One of these intervals was computed correctly, but the other was not. Which interval must be incorrect? each sample, the proportion who A. Ellie's interval must be incorrect. B. Alec's interval must be incorrect. C. It's impossible to answer this question without knowing the level of confidence used for each interval. D. It's impossible to answer this question without knowing the sample sizes. E. It's impossible to answer this question without knowing the sample sizes or the level of confidence used for each interval.

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4. Ellie and Alec are each attempting to estimate the
proportion of coffee drinkers who consume more than one
cup of coffee per day. They each obtain a random sample
of coffee drinkers, and, in each sample, the proportion who
drink more than one cup of coffee per day is 0.40. Ellie
and Alec each use their sample data to construct a
confidence interval. Ellie's interval is from 0.286 to 0.514,
and Alec's interval is from 0.346 to 0.474. One of these
intervals was computed correctly, but the other was not.
Which interval must be incorrect?
A. Ellie's interval must be incorrect.
B. Alec's interval must be incorrect.
C. It's impossible to answer this question without
knowing the level of confidence used for each
interval.
D. It's impossible to answer this question without
knowing the sample sizes.
E. It's impossible to answer this question without
knowing the sample sizes or the level of confidence
used for each interval.
Transcribed Image Text:4. Ellie and Alec are each attempting to estimate the proportion of coffee drinkers who consume more than one cup of coffee per day. They each obtain a random sample of coffee drinkers, and, in each sample, the proportion who drink more than one cup of coffee per day is 0.40. Ellie and Alec each use their sample data to construct a confidence interval. Ellie's interval is from 0.286 to 0.514, and Alec's interval is from 0.346 to 0.474. One of these intervals was computed correctly, but the other was not. Which interval must be incorrect? A. Ellie's interval must be incorrect. B. Alec's interval must be incorrect. C. It's impossible to answer this question without knowing the level of confidence used for each interval. D. It's impossible to answer this question without knowing the sample sizes. E. It's impossible to answer this question without knowing the sample sizes or the level of confidence used for each interval.
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