The Environmental Protection Agency has been studying Miller Creek regarding ammonia nitrogen concentration. For many years, the concentration has been 2.3 mg/l. |However, a new golf course and housing developments are raising concerns |that the concentration many changed because of increased use of lawn fertilizers. Any change (either increase or decrease) in the ammonia nitrogen concentration can affect plant and animal life in and around the creek. Let x be a random variable representing ammonia nitrogen concentration (mg/l). Based on recent studies of Miller Creek, we may assume that x has a normal distribution. Recently, a random sample of 10 water tests from the creek gave yielded a sample mean of 2.49 and the sample standard deviation was 0.349. Conduct an hypothesis test with an alpha level of 0.01 Excel code or input Sample Size (n) Sample Mean (x-bar) Standard Deviation Hypothesized Mean (u) the Null Hypothesis Alternative Hypothesis Standard Error Test Statistic (t) degrees of freedom s/sqrt(n) (s mean-u)/std error n-1 p-value (lower tail) p-value (upper tail) p-value (two tail) T.Dist(t,n-1, true) 1 - Lower tail value 2*MIN(L tail, U tail) alpha value appropriate p-value conclusion write in terms of the alternative hypothesis

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