9. The following table shows the number of bacteria colonies present in each of several petri dishes, after E. Coli bacteria were added to the dishes and they were incubated for 24 hours. The "soap" dishes contained a solution prepared from ordinary soap; the "control" dishes contained a solution of sterile water. Control 8 41.8 Soap 7 32.4 15.6 22.8 a) Apply a test to the 10% level to investigate whether soap affects the number of bacteria colonies that form. b) Draw a conclusion for your test.

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.