Question

1. Measurements of a blood enzyme LDH were taken on seven subjects before fasting and after fasting.

Subject	1	2	3	4	5	6	7
Before After	89 76	90 101	87 84	86 98	120 105	85 84	97 93

Calculate Wilcoxon’s signed-rank statistic by hand. Use the qsignrank() function to determine a p-value for the test for the null hypothesis that there is no difference in LDH before and after fasting vs. a two-sided alternative.

2.

Here are the records for cubic feet of recycled material collected for eighteen 2-week periods show the following volumes at a particular site.

1440	1570	1580	1590	1620	1660	1680	1690	1700
1720	1730	1750	1770	1800	1820	1900	1900	2010

Suppose we wanted to test whether the population mean is 1600 cubic feet. Is the t-test a reasonable test for these data? Explain.

Answer 1