For following situations identify the response variable and

For following situations, identify the response variable and the treatment/group variable, state the number of groups (k), the number of observations per group (ni ), the overall sample size (N).

In a study of to compare yield for 3 varieties of corn, seed for each variety was randomly assigned to four one acre plots (12 plots total). The yield of corn from each plot (bushels per plot) was measured.

Treatment Variable: _______________ N _____ k _____ ni _______ ResponseVariable: _______________
A microbiologist wants to compare the toxicity of 5 disinfecting cleaning products on a

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bacteria that is a common cause of food poisoning. She applies each cleaning product to 10 petri plates that contain the bacteria and measures the number of bacteria colonies present after 24 hours.

Treatment Variable: _______________ N _____ k _____ ni _______

ResponseVariable: _______________

Solution

For following situations, identify the response variable and the treatment/group variable, state the number of groups (k), the number of observations per group (ni ), the overall sample size (N).

In a study of to compare yield for 3 varieties of corn, seed for each variety was randomly assigned to four one acre plots (12 plots total). The yield of corn from each plot (bushels per plot) was measured.

Treatment Variable: = varieties of corn    N =12    k =3     ni =4

ResponseVariable: = yield of corn

A microbiologist wants to compare the toxicity of 5 disinfecting cleaning products on a bacteria that is a common cause of food poisoning. She applies each cleaning product to 10 petri plates that contain the bacteria and measures the number of bacteria colonies present after 24 hours.

Treatment Variable: disinfecting cleaning products N=50 k =5 ni =10

ResponseVariable: = number of bacteria colonies present