Considered safe for agricultural use. a well in texas is used to water crops. this well is tested on a regular basis for arsenic. a random sample of 36 tests gave a sample mean of = 7.3 ppb arsenic, with s = 1.9 ppb. does this information indicate that the mean level of arsenic in this well is less than 8 ppb? use a 0.01 level of signifcance..

This information indicates that the mean level of arsenic in this well is less than 8 ppbat  0.01 level of signifcance..

Step-by-step explanation:

Given that a well in Texas is used to water crops.

This well is tested on a regular basis for arsenic.

A random sample of 36 tests gave a sample mean of = 7.3 ppb arsenic, with s = 1.9 ppb

H0: Sample mean = 8

Ha: Sample mean <8

(left tailed test at 1% level)

Mean difference =-0.70

Std error of mean =

Test statistic t = -2.204

df = 35

p value = 0.0171

Since p >0.01 we accept H0

This information indicates that the mean level of arsenic in this well is less than 8 ppbat  0.01 level of signifcance..

step-by-step explanation:

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