The correct option is the a. reliability factor.
The probability that a product will continue to function normally over a specific time period and under specific circumstances is known as reliability. The point estimate's sample distribution and level of confidence are used to calculate the reliability factor.
It is estimated by comparing different forms of the same measurement. It depends on the scale's length, item definition, uniformity of the groups, duration, objectivity of scoring, measuring conditions, explanation of the scale, characteristics of the scale's items, and scale difficulty.
As the reliability factor increases, the width of the confidence interval increases. While sample size and degree of freedom shrink the confidence interval.
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