Problem Solving .

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1. PROBLEM SOLVING: 1. Professor XYZ conducted a review in his ITTAS 102 class. He gave an examination before and after the review and gathered the following data. Student Score Before Review Score After Review 16 18 8 12 12 10 10 17 20 18 17 20 9 11 10 9 18 17 19 20 At a = 0.05 level of significance, is the review class effective? 2. A correlation coefficient is 0.80 and the number of observations is 62. What is the calculated test statistic? Is this significant correlation using a 5% level of significance? 3. What are the importance of forecasting? 4. Which is more accurate method of forecasting, Quantitative or Qualitative? Justify your answers. 5. A firms sales for a product line during the 12 quarters of the past three years were as follows, Forecast the sales for the 13th, 14th, 15th and 16th quarters. Quarter Sales 600 1550 1500 1500 2400 3100 2600 2900 3800 4500 4000 4900