5.3.2. The production of a nationally marketed deter- gent results in certain workers receiving prolonged expo- sures to a Bacillus subtilis enzyme. Nineteen workers were tested to determine the effects of those expo- sures, if any, on various respiratory functions. One such function, air-flow rate, is measured by computing the ratio of a person's forced expiratory volume (FEV,) to his or her vital capacity (VC). (Vital capacity is the maximum volume of air a person can exhale after taking as deep a breath as possible; FEV, is the max- imum volume of air a person can exhale in one sec- ond.) In persons with no lung dysfunction, the “norm" for FEV,/VC ratios is 0.80. Based on the following data (164), is it believable that exposure to the Bacillus sub- tilis enzyme has no effect on the FEV,/VC ratio? Answer the question by constructing a 95% confidence interval. Assume that FEV,/VC ratios are normally distributed with o =0.09.

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Subject FEV,/VC
Subject FEV,/VC
RH
0.61
WS
0.78
RB
0.70
RV
0.84
MB
0.63
EN
0.83
DM
0.76
WD
0.82
WB
0.67
FR
0.74
RB
0.72
PD
0.85
BF
0.64
ЕВ
0.73
0.85
0.87
JT
0.82
РС
PS
0.88
RW
RB
0.82
Transcribed Image Text:Subject FEV,/VC Subject FEV,/VC RH 0.61 WS 0.78 RB 0.70 RV 0.84 MB 0.63 EN 0.83 DM 0.76 WD 0.82 WB 0.67 FR 0.74 RB 0.72 PD 0.85 BF 0.64 ЕВ 0.73 0.85 0.87 JT 0.82 РС PS 0.88 RW RB 0.82
5.3.2. The production of a nationally marketed deter-
gent results in certain workers receiving prolonged expo-
sures to a Bacillus subtilis enzyme. Nineteen workers
were tested to determine the effects of those expo-
sures, if any, on various respiratory functions. One such
function, air-flow rate, is measured by computing the
ratio of a person's forced expiratory volume (FEV,)
to his or her vital capacity (VC). (Vital capacity is
the maximum volume of air a person can exhale after
taking as deep a breath as possible; FEV, is the max-
imum volume of air a person can exhale in one sec-
ond.) In persons with no lung dysfunction, the “norm"
for FEV,/VC ratios is 0.80. Based on the following data
(164), is it believable that exposure to the Bacillus sub-
tilis enzyme has no effect on the FEV,/VC ratio? Answer
the question by constructing a 95% confidence interval.
Assume that FEV¡/VC ratios are normally distributed with
o =0.09.
Transcribed Image Text:5.3.2. The production of a nationally marketed deter- gent results in certain workers receiving prolonged expo- sures to a Bacillus subtilis enzyme. Nineteen workers were tested to determine the effects of those expo- sures, if any, on various respiratory functions. One such function, air-flow rate, is measured by computing the ratio of a person's forced expiratory volume (FEV,) to his or her vital capacity (VC). (Vital capacity is the maximum volume of air a person can exhale after taking as deep a breath as possible; FEV, is the max- imum volume of air a person can exhale in one sec- ond.) In persons with no lung dysfunction, the “norm" for FEV,/VC ratios is 0.80. Based on the following data (164), is it believable that exposure to the Bacillus sub- tilis enzyme has no effect on the FEV,/VC ratio? Answer the question by constructing a 95% confidence interval. Assume that FEV¡/VC ratios are normally distributed with o =0.09.
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