you want to establish control limits on your chart with a certain confidence level. you are using a z-value of 2.58. what percentage confidence interval is implied by this z-value? enter your answer as a number between 0 and 100. for example, if you want to enter 56.78%, enter 56.78. take care not to enter 0.5678.

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09-12-2022
Mathematics

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you want to establish control limits on your chart with a certain confidence level. you are using a z-value of 2.58. what percentage confidence interval is implied by this z-value? enter your answer as a number between 0 and 100. for example, if you want to enter 56.78%, enter 56.78. take care not to enter 0.5678.

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abhinavjh321 abhinavjh321 · Answer 1 · 2022-12-18T22:10:25-05:00

The Z-value of 2.58 implies a 97.72% confidence interval. This is because the Z-value of 2.58 corresponds to a probability of 0.9974 (which is 1 - 0.0026). This 0.9974 probability is equivalent to a 97.72% confidence interval.

The Z-value of 2.58 corresponds to a probability of 0.9974 (or 1 - 0.0026). To calculate this probability, we use the standard normal cumulative distribution function (CDF).

Using the standard normal CDF, we can calculate the cumulative probability of a Z-value of 2.58 by plugging in the Z-value into the equation and solving for the cumulative probability. The standard normal CDF is given by the following equation:

P(Z <= z) = 1 - 1/2*(1 + erf(z/sqrt(2)))

Plugging in the Z-value of 2.58 into the equation, we get:

P(Z <= 2.58) = 1 - 1/2*(1 + erf(2.58/sqrt(2)))

Solving for the cumulative probability, we get:

P(Z <= 2.58) = 0.9974

This 0.9974 probability is equivalent to a 97.72% confidence interval.

Learn more about probability here

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