Problem 4CQQ

Identify the value of the test statistic in the display included with Exercise. In general, do larger test statistics result in larger T-values, smaller P-values, or P-values that are unrelated to the value of the test statistic?

Exercise

Measures of Voltage The author measured voltage amounts from three different sources: (1) electricity supplied directly to the author’s home, (2) an independent gas-powered Generac generator (model PP 5000), and (3) an uninterruptible power supply (APC model CS 350) connected to the author’s home power supply. The results from analysis of variance are shown below. What is the null hypothesis for this analysis of variance test? What specific result is used in deciding to reject H0 or fail to reject H0? Based on the displayed results, should you reject H0 or fail to reject H0?

Answer:

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From the MINITAB output,

Test statistic: F = 183.01. In general, larger test statistics result in smaller P-values.

The P-value given in the output is 0.000

The smaller P-value is, the stronger the evidence against H0 and in favor of H1. If P-value is small like 0.01 or smaller, we may conclude that the...