Consider the following experiment, which was performed at a pulp mill. Plant per
ID: 3069459 • Letter: C
Question
Consider the following experiment, which was performed at a pulp mill. Plant performance is
based on pulp reflectance, as measured by a reflectance meter. Each of the four shift operators
(denoted by A, B, C and D) made five pulp handsheets from unbleached pulp. The reflectance of
each handsheet was measured using a photometer. The data set is shown next.
Measured Reflectance from Different Operators
The goal of the experiment is to determine whether there are differences between the operators in
making the handsheets and reading their reflectance.
Questions for all the following cases:
Please identify:
1. Identify the independent variable(s)? What levels of these variables were used?
2. Classify IVs as within- or between-subjects.
3. Identify the dependent variable(s). How were these variables measured?
4. Identify Experimental units and observational units.
5. Identify 1 possible confounding variables, and discuss the likelihood and severity of these
confounders.
6. Identify 1 random variables (i.e. those that were not controls, confounders, etc.).
7. Try to identify ‘important’ random variables, and explain why you have listed them
consider the following experiment, which was performed at a pulp mill, Plant performance is hased on pulp reflectance, as measured by reflectance meter. Each of the four shift operators oted by A, B, C and D) made five pulp handsheets from unbleached pulp. The reflectance of h handsheet was measured usingphotometer. The data set is shown next. Measured Refleetance from Different O Operator A Operator Operator Operator D 59.88 60.12 60.88 60.98 59.9 59.87 60.32 60.42 59.99 60.12 60.83 60.87 60.56 61 60.5 61.01 60.87 60.69 60.53 60.63 The goal of the experiment is to determine whether there are differences between t making the handsheets and reading their reflectance. he operators in Questions for all the following cases: Please identify 1. Identify the independent variable(s)? What levels of these variables were used? 2. Classify IVs as within- or between-subjects. 3. Identify the dependent variable(s). How were these variables measured? 4. Identify Experimental units and observational units. 5. Identify I possible confounding variables, and discuss the likelihood and severity of these confounders Identify 1 random variables (i.e. those that were not controls, confounders, etc.). Try to identify 'important' random variables, and explain why you have listed them 6. 7.Explanation / Answer
1)
operators are independent variables. There are 4 different operators so four different levels are used
2)
The IV here would be considered as Between-subjects
3)
dependence variable is Plant Performance
it is measured based on pulp reflectance by reflectance meter
4)
The experimental units are the operators and observational units are the pulp reflectance readings
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