A consumer protection organiza

A consumer protection organization wants to compare the annual power consumption of five different brands of dehumidifiers. Because power consumption depends on the prevailing humidity level, each brand was tested at four different humidity levels, ranging from moderate to heavy humidity. For each brand, a sample of four humidifiers was randomly assigned, one each, to the four humidity levels. The resulting annual power consumption (in kilowatt-hours) is given in the following table:

a. Using    .01, can you conclude that there is a difference between the power consumptions of the five brands?

b. Using    .01, can you conclude that there are differences in power consumption between the levels of the blocking factor “humidity”? Does this result support the experimenters’ use of humidity as a blocking factor?

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