4. (20 points) a. In an analysis of variable, what do the sum of squares within (SSW) and the sum of squares between (SSB or SSG) mean. - Explain. Why is it that a one-way analysis of variance is always an upper-tail test? b. What are the disadvantages of an unweighted price index? What is done to avoid these disadvantages? c. What are the components of a time series? Give a brief narrative on each of these components.

6. (20 points) Three suppliers provide 500 one-gram packets of saffron per shipment to a departmental store. Random samples of six shipments from each of the three suppliers - Shujon Traders, Lavender, Just Quality -- were carefully checked, and the number of packets not conforming to the quality specifications is counted. These numbers are listed in the table below. Shujon Traders Lavender Just Quality 28 22 33 37 27 29 34 29 39 29 20 33 31 18 37 33 30 38 At .05 level of significance, test the hypothesis that population mean several packets per shipment not meeting the quality specification are the same for all three suppliers.