MODULE 5 Hypothesis Tests for a Population Mean - Lab AEC 505 Statistical Methods in Agriculture Instructor: Dr. Jose Lopez In 2002, the mean pH level of the rain in the Columbia River Gorge, Washington, was 5.21 A biologist wonders if the acidity of rain has changed. From a random sample of 16 rain dates in 2007, she obtains the following data: Source: National Atmospheric Deposition Program. 1) Use Microsoft Excel to draw a boxplot of the pH level of the rain data. Copy and paste the boxplot from your Microsoft Excel document to this Word document. (Points: 10) 2) Use your boxplot and the summary table below to write a paragraph assessing the shape of the distribution of the pH level of the rain data. Is the shape of the sample distribution very left skewed, very right skewed, or fairly normal? Make sure you fully justify your answer if you want to receive full credit in this question. (Points: 10) Statistics pH level Mean Median 3) List the conditions for testing hypotheses regarding the population mean. Are the conditions for hypothesis testing satisfied? Make sure you explain why. (Points: 10) 4) A biologist believes the acidity of rain has changed from the 2002 level of 52?. (Points: 10) i State the null and alternative hypotheses for the population m in words. ii. State the null and alternative hypotheses for the population mean using the mathematical thatign. 5) Use the insert equation button from Microsoft Word to type the formula(s) for calculating the test statistic. Assume o is known. TC Econ-on Click on the Insert tab, then click on the Equation button ' , then use the Structures buttons iexnxfi 25. Wed sa= AB? Fraction Script Radical Integral large Bradiet Function Accent limit and Creator Matrix 1 v 1- v Operator v v F L09 v v Structures and the Symbols buttons