A chemist has run an experiment to study the effect of four treatments on the glass transition temperature (in degrees Kelvin) of a particular polymer compound. Raw material used to make this polymer is bought in small batches. The material is thought to be fairly uniform within a batch but variable between batches. Therefore, each treatment was run on samples from each batch with the results shown in the table.

a. Do the data provide sufficient evidence to indicate a difference in mean temperature among the four treatments? Use α = .05.

b. Is there sufficient evidence to indicate a difference in mean temperature among the three batches? Use α = .05.

c. If the experiment were to be conducted again in the future, would you recommend any changes in the design of the experiment?

Transcribed Image Text:

POLYMER Treatment 1 2 4 1 576 584 562 543 Batch 2 515 563 522 536 3 562 555 550 530 3.