Suppose that we had the following results from an experiment in which we measured the growth...
Suppose that we had the following results from an experiment in which we measured the growth of a cell culture (as optical density) at different pH levels. (8 marks)
pH 4.5 5 5.5 6 6.5 7
Optical Density 0.15 0.22 0.25 0.32 0.33 0.35
(i) Find the equation that fits these data.
(ii) Use the regression equation to find the Optical Density when the pH level is 7.5.
(iii) Use the regression equation to find the pH level when the Optical Density is 0.20.
(iv) Calculate r.
(v) Is there a positive correlation between pH levels and Optical Density? Test at the 5% level of significance.
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