Question
Discuss the characteristics of an ideal questionnaire.
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| Particulars | Mobile $A$ | Mobile $B$ |
| Raw material | $5000$ | $6000$ |
| Assembly expense | $3000$ | $3000$ |
| Other expense | $4000$ | $4500$ |
| Total expense | $12000$ | $13500$ |
| Selling price | $13000$ | $15000$ |
| Marks | $12 – 16$ | $17 – 21$ | $22 – 26$ | $27 – 31$ | $32 – 36$ |
| No. of students | $2$ | $3$ | $14$ | $8$ | $3$ |

| Income (thousand $Rs)$ | Less than $4$ | $4- 8$ | $8- 12$ | $12 – 20$ | $20 – 28$ | $28 – 36$ |
| No. of Persons | $6$ | $14$ | $31$ | $35$ | $28$ | $16$ |