Question

It is desired to estimate average annual wool yield per sheep for a herd of 150 at a certain farm house using stratified simple random sampling. Sheeps in the herd are to be grouped into three strata on the basis of first shaving in days. Optimum method sample allocation is said to be used for selecting the overall sample of 25 sheeps from the three strata. Determine approximately optimum strata boundaries using the information on first shaving given below.

Shaving days No. of Sheep
(f )

Image ignouassignments-ignouacademy-com--p-yield-73543

equation
30-70 6 2. 45
70-110 2 1.414
110-150 1 1
150-190 4 2
190-230 2 1.414
230-270 7 2. 646
270-310 8 2.828
310-350 20 4.472
350-390 10 3.162
390-430 25 5
430-470 40 6. 325
470-510 25 5
13 Feb 2025
Answer :
Word Count : 318
Given the classwise values of $\sqrt{f}$: 30–70: 2.450 70–110: 1.414 110–150: 1.000 150–190: 2.000 190–230: 1.414 230–270: 2.646 270–310: 2.828 310–350: 4.472 350–390: 3.162 390–430: 5.000 430–470: 6.325 470–510: 5.000 Sum of all $\sqrt{f}$: 2.450 + 1.414 + 1.000 + 2.000 + 1.414 + 2.646 + 2.828 + 4.472 + 3.162 + 5.000 + 6.325 + 5.000 = 37.711 For 3 strata we _______ _____ _____ ___ _______ _________ __________ ______.
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