COMM 291 Lecture Notes - Statistical Hypothesis Testing, Null Hypothesis
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COMM 291 Full Course Notes
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Sonia bains: the populations being examined are 1) houses without fireplaces and currently for sale and 2) houses with one or more fireplaces and currently for sale. Since ( ) ( ), we can pool and into d. f. and p-value ( ) The evidence is extremely strong that the listing prices of houses without fireplaces and houses with are different. There is very strong evidence that the living area of houses without fireplaces and houses with fireplaces are different. There is very strong evidence that the age of houses without fireplaces and houses with fireplaces are different. Houses with fireplaces are newer: 95% ci for. Sonia bains: the null value of 0 is not within the 95% ci for . Therefore we reject the null hypothesis in a 2-sided hypothesis test at , which is consistent with our results in part b).