10.2.9
An article in Radio Engineering and Electronic Physics(1980, Vol. 25, pp. 74-79) investigated the behavior of astochastic generator in the presence of external noise. The numberof periods was measured in a sample of 100 trains for each of twodifferent levels of noise voltage, 100 and 150 mV. For 100 mV, themean number of periods in a train was 7.9 withs1 = 2.6. For 150 mV, the mean was 6.9 withs2 = 2.4.
Use α = 0.01 and assume that each population isnormally distributed and the two population variances areequal.
(a) It was originally suspected that raising noise voltage wouldreduce mean number of periods. Do the data support thisclaim?Choose the answer from the menu in accordance to the questionstatementChoose the answer from the menu in accordance to thequestion statement
No.Yes.
(b) Calculate a confidence interval to answer the question inpart (a).
μ1−μ2≥Enter your answer in accordance to the questionstatementEnter your answer in accordance to the question statement.Round your answer to three decimal places (e.g. 98.765).
