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# A FIELD RESEARCHER IS GATHERING DATA ON THE TRUNK DIAMETERS OF MATURE

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Author: Christine Farr
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Question 1:A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the 0.10 level of significance, that the average trunk diameter of a pine tree is greater than the average diameter of a spruce tree? Pine trees Spruce trees Sample size 30 35 Mean trunk diameter (cm) 45 39 Sample variance 120 140 What is the test value for this hypothesis test? Round your answer to three decimal places.What is the critical value? Round your answer to three decimal places.Question 2:Data for a sample of 25 apartments in a particular neighborhood are provided in the worksheet Apartments in the Excel workbook Apartments.xlsx. Using the estimated regression equation found by using size as the predictor variable, find a point estimate for the average monthly rent for apartments having 1,000 square feet of space. Place your answer, rounded to the nearest whole dollar, in the blank. When entering your answer do not use any labels or symbols. Simply provide the numerical value. For example, 123 would be a legitimate entry.Rent Size950 8501600 14501200 10851500 1232950 7181700 14851650 1136935 726875 7001150 9561400 11001650 12852300 19851800 13691400 11751450 12251100 12451700 12591200 11501150 8961600 13611650 10401200 755

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