a) Identify the type of study described here. b) Discuss the types of inference that can and cannot be drawn from this study. 2) A textile engineer is interested
1. Engineers are interested in comparing the mean hydrogen production rates per day for three different heliostat sizes. From the past week's records, the engineers obtained the amount of hydrogen produced per day for each of three heliostat sizes. Then they computed and compared the sample means, which showed that
the mean production rate per day increased with
the heliostat sizes.
a) Identify the type of study described here.
b) Discuss the types of inference that can and
cannot be drawn from this study.
2) A textile engineer is interested in measuring heat
resistance of four different types of treads used in
making fire-resistant clothing for firefighters. A random sample of 20 threads from each type was
taken and subjected to a heat test to determine
resistance (the length of time the fibers survive
before starting to burn).
a) Explain what type of study this is and why.
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