Recent content by cfcwhite

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    One way ANOVA or Two Way ANOVA?

    The question is vague. I would assume the four preservatives are tested in the same 24hr period on four separate occasions.
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    One way ANOVA or Two Way ANOVA?

    Hi all. I was given this assignment and asked to analyse the data (5% level of significance). Should I be using two one-way ANOVAs to compare the effect of preservative and days (independent variables) on the bacterial count (dependent) separately? Or should I be using a two-way ANOVA to...
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    Using Residuals to Make Conclusions

    Thanks for the help.
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    Using Residuals to Make Conclusions

    Thanks for the reply. I used matlab for the residual plot and did it manually using number of bacteria - predicted number of bacteria (mean) for each day. This is a boxplot for the data.
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    Using Residuals to Make Conclusions

    Hi, I was recently given an assignment to analyse the residuals for 4 days of the following data. After plotting the residuals, what does this tell me about my data? I'm a bit confused with the context. Thanks. I found the residuals by subtracting the observed value from the overall mean of...