Use a t test to test the significance of the coefficient on the interaction variable in question 31. Construct a 90 % confidence interval for this coefficient.

Question 31

A biologist is interested in the effect of temperature and humidity on cell growth. She collects the following information from 8 samples:

Use the MINITAB program to estimate the relationship among number of cells, temperature, and humidity. Use an interaction variable to estimate the interaction effect of temperature and humidity on cell growth. Interpret your results.

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Sample 123&SON 4 5 6 7 8 Temperature () 50 55 60 60 70 75 80 85 Humidity (%) 20 30 40 50 45 70 65 80 Number of cells 100 125 175 200 218 235 220 250