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A philanthropic organisation sent free mailing labels and greeting cards to a random sample of 100,000...

A philanthropic organisation sent free mailing labels and greeting cards to a random sample of 100,000

potential donors on their mailing list and received 5293 donations.

​(a) Give a 90​% confidence interval for the true proportion of those from their entire mailing list who may donate.

​(b) A staff member thinks that the true rate is 55​%. Given the confidence interval you​ found, do you find that rate​plausible?

Math   Statistics-And-Probability   
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