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26 votes
How to find sample size with unknown standard deviation

User Raymond Nijland
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1 Answer

11 votes
11 votes

Answer:

za/2: Divide the confidence level by two, and look that area up in the z-table: .95 / 2 = 0.475. ...

E (margin of error): Divide the given width by 2. 6% / 2. ...

: use the given percentage. 41% = 0.41. ...

: subtract. from 1.

User Bojan Borisovski
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