27 Jun BIOL 458 Biometry Lab 4: HYPOTHESIS TESTS USING SPSS
Question
TESTING THE DIFFERENCES BETWEEN MEANS.
Two energy saving concepts in home building are solar powered homes and earth sheltered homes. Suppose you are drawing up plans for a new home and want to compare the expected annual heating costs for the two types of innovation. Independent random samples of solar-powered homes yielded the summary data on annual heating costs shown below. Assume random and independent sampling, and that the homes were comparable with respect to size, climatic conditions, etc.
Is there evidence (at the ? = 0.05 significance level) that the mean annual cost of heating an earth sheltered home is significantly less than the corresponding cost of heating a solar powered home?
SOLAR POWERED EARTH-SHELTERED
n = 12 n=6
sample mean=$285 sample mean = $ 234
s = $55 s=$26
Hint: Would a one-tailed or two-tailed test be of interest to the potential homebuilder?
CALCULATE THE TEST STATISTIC, DETERMINE THE REJECTION REGION, ACCEPT OR REJECT THE NULL HYPOTHESIS.
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