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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When it comes to the concept of polynomial equations, quadratic equations can be said to be a special case. What does solving a quadratic equation mean? We will understand the quadratics and their types once we are familiar with the polynomial equations and their types.

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The concept of demand and supply is important for various factors. One of them is studying and evaluating the condition of an economy within a given period of time. The analysis or evaluation of the demand side factors are important for the suppliers to understand the consumer behavior. The evaluation of supply side factors is important for the consumers in order to understand that what kind of combination of goods or what kind of goods and services he or she should consume in order to maximize his utility and minimize the cost. Therefore, in microeconomics both of these concepts are extremely important in order to have an idea that what exactly is going on in the economy.