Question

1.88 Longleaf pine trees. The Wade Tract in Thomas County, Georgia, is an old- growth forest of longleaf pine trees (Pinus palustris) that has survived in a relatively undisturbed state since before the settlement of the area by Europeans. A study collected 584 of these trees.29 One of the variables measured was the diameter at breast height (DBH). This is the diameter of the tree at 4.5 feet and the units are centimeters (cm) Only trees with DBH greater than 1.5 cm were sampled. Here are the diameters of a PINES data on random sample of 40 of these trees: 10.5 13.3 26.0 18.3 52.2 9.2 26.1 17.6 40.5 31.8 47,2 44.4 16.9 35.7 11.4 2.7 69.3 5.4 44.2 2.2 4.3 38.1 7,8 2.2 11.4 51.5 4.9 39.7 32.6 51.8 22.3 43.3 29.1 27.9 43.6 2.3 44.6 31.5 40.3 37.5 (a) Find the five-number summary for these data. (b) Make a boxplot. (c) Make a histogram (d) Write a short summary of the major features of this distribution. Do you prefer the boxplot or the histogram for these data?

Answer 1

File Edit Data Calc Stat Graph Editor Tools Window Help 3 07-Jun-19 10:10:57 PM Welcome to Minitab, press F1 for help. Descriptive Statistics: C1 Variable Mean StDev Variance Minimum Maximum C1 27.29 17.71 313.50 2.20 69.30 C1 C2 C3 C4 C5 C6 35 40.3 22.3 36 37 43.3 38 37.5 29 39 40 27.9 41 42 Projec Current Worksheet Worksheet

Session C1 Boxplot of C1 Boxplot of C1 70 60 50 CII 40 Q1=31.5 Median 40.3 Q3 47.2 30 15.7 Whiskr N 1074 69.3 20 10 Vorksheet 1 e DELL F4 F5 F6 FB F10 $ % A & 3 4 2 5 7

11 M Tools Window Help Assistant Edit Data Calc Stat Graph Editor XQ Sessic Histogram of C Histogram of C1 to Normal 250 Mean 38.68 StDev 14.36 1074 200 150 et 1 C1 00 6 50 7 8 20 30 40 50 60 70 40 C1 41 42 Projec.. : Histo ent Worksheet: Worksheet 1 DEL F2 ouanbaij
according to distribution of data and data visuals the data shows the normality. There fore we can say that histogram is good visual graph for this data presentation.