Answer :
Final answer:
In statistics, a p-chart is used to control and monitor proportions or percentages over time. The z-value determines the level of certainty in our estimate. To obtain a 99.7 percent confidence level, we would use a z-value of 3.
Explanation:
In statistics, a p-chart is used to control and monitor proportions or percentages over time. The confidence level determines the level of certainty we have in our estimate. A z-value is used to calculate the confidence interval, which represents the range of values within which the true proportion is likely to fall.
To obtain a 99.7 percent confidence level, we would use a z-value of 3. This means that we are 99.7% confident that the true proportion lies within the calculated confidence interval.
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