A researcher wanted to determine if carpeted or uncarpeted rooms contain more ba

Question

A researcher wanted to determine if carpeted or uncarpeted rooms contain more bacteria. The table shows the results for the number of bacteria per cubic foot for both types of rooms. A normal probability plot and boxplot indicate that the data are approximately normally distributed with no outliers. Do carpeted rooms have more bacteria than uncarpeted rooms at the alphaequals0.05 level of? significance?

Find t not?

Carpeted Uncarpeted 10.6 8.9 9.2 6.7 8 9 14.1 7.9 6.4 11.2 11.2 12.7 8.7 11 8.5 11.9

Explanation / Answer

Sol:

t-Test: Two-Sample Assuming Unequal Variances Carpeted Uncarpeted Mean 9.5875 9.9125 Variance 5.54125 4.398392857 Observations 8 8 Hypothesized Mean Difference 0 df 14 t Stat -0.291570086 P(T<=t) one-tail 0.387445457 t Critical one-tail 1.761310136 P(T<=t) two-tail 0.774890914 t Critical two-tail 2.144786688

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