An Oregon wine association wants to determine the proportion of West Coast consumers who would spend at least $30 on Willamette Valley pinot noir at a 99% confidence level. If they wish to have an error of no more than 4%, how large a sample must they take?

The minimum sample size required is 1041.

Step-by-step explanation:

Assume that the proportion of West Coast consumers who would spend at least $30 on Willamette Valley be 50%.

That is, p = 0.50.

The margin of error is computed using the formula:

Given:

MOE = 0.04

Critical value =

*Use the z-table for the critical value.

Compute the value of n as follows:

Thus, the minimum sample size required is 1041.

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step-by-step explanation:

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