QUESTION 16 15 Biologists are investigating if their efforts to prevent erosion on the bank of a stream have been working. For this stream, narrow channel width is a good indicator that erosion is not occurring. Test the claim that the mean width of ten locations within the stream is more than 3.5 meters. Show your work. Use a .05 significance level and the following sample data: 2.3 5.3 3.5 4.9 4.5 4.1 4.1 5 7.3 6.2 The sample standard deviation is 1.4 (hint: you need to calculate x-bar) Complete the following questions. 1. What are the null and alternative hypotheses. 2. Calculate the test statistic. 3. What is the level of significance? 4. The p-value is 0.039. What is your decision about the null hypothesis? 5. What is your conclusion