An environmental chemist is performing a study of iron in atmospheric particulate measured downwind from a steel mill. She is concerned that the iron readings on a windy day will be lower compared to calm days. She obtained observations on 30 randomly chosen days during the period of peak operation of the mill and compare measurements taken on days when the wind is calm with measurements taken on windy days.

Windy Days

0.25 0.29 0.30 0.43 0.45 0.50 0.60 0.65 0.69 0.74 0.80 0.87 0.87 0.89 0.91 0.92 0.93 0.95 1.01 1.03 1.16

Calm Days

0.68 0.74 0.88 0.89 0.97 1.00 1.17 1.25 1.27

(a) What hypothesis can be tested about the effect of wind on the measurement of iron in atmospheric particulate?

(b) Are you willing to assume that the underlying variances are equal? Justify your answer

Answer rating: 100% (QA)

For windy days 025029030043045050060065069074080087087089091092093095101103116 Total numbers n1 21 Standard deviation s1 02613 Mean x1 072571428571429 ... View the full answer