If other factors are held constant, what is the effect of increasing the level o

Question

If other factors are held constant, what is the effect of increasing the level of confidence (for example from 80% to 90%)? The range of t scores decreases and the width of the interval increases. The range of t scores increases and the width of the interval increases.     The range of t scores increases and the width of the interval decreases. The range of t scores decreases and the width of the interval decrease



Which of the following statements are true?

The sample variance is a point estimator of the population variance. A point estimate of a population parameter (theta) is obtained by selecting a suitable statistic and computing its value from the given sample data. The selected statistic is called the point estimator of (theta).     The sample mean is a point estimator of the population mean. A point estimate of a population parameter (theta) is a single number that can be regarded as a sensible value of (theta). All of the statements listed are true.

Explanation / Answer

Answer - 1: If other factors held constant then by increasing the level of confidence, The range of t scores increases and the width of the interval increases.

Answer - 2: All of the statements listed are true.

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