February 24, 2017

Homework Help: STATISTICS

Posted by Keirson on Thursday, October 11, 2007 at 7:26pm.

Bacterial samples were taken from several surfaces in a daycare and incubated in petri dishes. After that the number of bateria colonies were counted, with the following results 412, 437, 425, 476, 451, 483.

1) construct a 95% confidence interval for the mean number of colonies

2) after constructing the interval above, the resarcher notices that it is quite wide, and wishes to do a follow-up study with greater precision. How large a sample is reuired to produce a 95% confidence interval with margin of error 5?


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