A manufacturer claimed that at least 20% of the public preferred her product. A sample of 100 persons is taken to check her claim. Withhow small would the sample percentage need to be before the claim could legitimately be refuted? (notice that this would invovle a one-tailed test of the hypothesis)
The book mentions that the answer isbut im not sure how they calculated this.
I tried using
but got really stuck and couldn't calculate it out, so not sure if im on the right track...
Adopt decision rule using one-tailed test as follows:Originally Posted by Robb
A manufacturer claimed that at least 20% of the public preferred her product. A sample of 100 persons is taken to check her claim. With
The book mentions that the answer is
I tried using
Accept, ifor the standard mean,
greater than
;
Reject otherwise.
Sample size,
Proportion,
Sample mean,
Standard deviation
Minimum required sample proportion(0.04)+0.2=0.1342)
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