Stratified samples are widely used to study large areas of forest. Based on sate

Question

Stratified samples are widely used to study large areas of forest. Based on satellite images, a forest area in the Amazon basin is divided into 14 types. Foresters studied the four most commercially valuable types: alluvial climax forests of quality levels 1, 2, and 3, and mature secondary forest. They divided the area of each type into large parcels, chose parcels of each type at random, and counted tree species in a 20- by 25-meter rectangle randomly placed within each parcel selected. Here is some detail.

Choose the stratified sample of 18 parcels. Use Table B, starting at line 106. (Label each type of parcel, starting with 01. Enter your answers as comma-separated lists.)

Climax 1 parcels:

Climax 2 parcels:

Climax 3 parcels:

Explanation / Answer

From line number 106, we need to choose two random numbers which shall be the number of parcels for the 4 forest types. Hence,

Climax 1 parcels:68

Climax 2 parcels:41

Climax 3 parcels: 73

Secondary parcels:50

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