We Have Calculated a 95% Confidence Interval and Would Like $z ^ { * }$

question 19

Multiple Choice

We have calculated a 95% confidence interval and would like our next
Confidence interval to have a smaller margin of error without losing any
Confidence. In order to do this, we can I. change the $z ^ { * }$ value to a smaller number.
II. take a larger sample.
III. take a smaller sample.

• A) I only
• B) II only
• C) III only
• D) I and II
• E) I and III

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Definitions:

Sample Means

The average values obtained from statistical samples drawn from a population.

Zone Boundaries

Predetermined limits in a chart or graph that separate different levels of data for analysis or categorization purposes.

Lower Control Limit

In quality control charts, it is a threshold value below which a process is considered out of control and indicating a systemic decrease in quality.

Sample Proportions

It's the fraction or percentage of observations that fall into one category of a categorical variable in a sample of the population.