## Question

###### Unfortunately, arsenic occurs naturally in some groundwater.† A mean arsenic level of ???? = 8.0 partsper billion (ppb) is considered safe for agricultural use. A wellin Texas is used to water cotton crops. This well is tested on aregular basis for arsenic. A random sample of 31 testsgave a sample mean of x = 6.9 ppbarsenic, with s = 2.4 ppb. Does thisinformation indicate that the mean level of arsenic in this well isless than 8 ppb? Use ???? = 0.01.(a)What is the level of significance?(b)What i

Unfortunately, arsenic occurs naturally in some ground water.† A mean arsenic level of ???? = 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 31 tests gave a sample mean of x = 6.9 ppb arsenic, with s = 2.4 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use ???? = 0.01. (a) What is the level of significance? (b) What is the value of the sample test statistic? (Round your answer to three decimal places.)

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