Question

Exposure to microbial products, especially endotoxin, may have an impact on vulnerability to allergic diseases. The following are data on concentration (EU/mg) in settled dust for one sample of urban homes and another of farm homes.

U: 6.0 5.0 11.0 33.0 4.0 5.0 80.0 18.0 35.0 17.0 23.0
F: 2.0 15.0 12.0 8.0 8.0 7.0 6.0 19.0 3.0 9.8 22.0
(a) Determine the sample mean for each sample. (Round your answers to two decimal places.)

Answer 1

sample mean for Urban homes=21.545

sample mean for far homes=10.164

Explanation:

The sample mean of urban homes can be calculated as

sample mean of urban homes=xbarU=∑ui/number of values in U=∑ui/n

xbarU=6+5+11+33+4+5+80+18+35+17+23/11

xbarU=237/11

xbarU=21.545

The sample mean of farm homes can be calculated as

sample mean of farm homes=xbarF=∑fi/number of values in F=∑fi/n

xbarF=2+15+12+8+8+7+6+19+3+9.8+22/11

xbarF=111.8/11

xbarF=10.164