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Sampling Techniques and Statistical Inference 3 Mark Book Back Question Paper With Answer Key

12th Standard

    Reg.No. :
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Business Maths

Time : 00:45:00 Hrs
Total Marks : 45

    3 Marks 

    15 x 3 = 45
  1. Using the following random number table (Kendall-Babington Smith)

    23 15 75 48 59 01 83 72 59 93 76 24 97 08 86 95 23 03 67 44
    05 54 55 50 43 10 53 74 35 08 90 61 18 37 44 10 96 22 13 43
    14 87 16 03 50 32 40 43 62 23 50 05 10 03 22 11 54 36 08 34
    38 97 67 49 51 94 05 17 58 53 78 80 59 01 94 32 42 87 16 95
    97 31 26 17 18 99 75 53 08 70 94 25 12 58 41 54 88 21 05 13

    Draw a random sample of 10 four- figure numbers starting from 1550 to 8000.

  2. From the following data, select 68 random samples from the population of heterogeneous group with size of 500 through stratified random sampling, considering the following categories as strata.
    Category 1: Lower income class - 39%
    Category 2: Middle income class - 38%
    Category 3: Upper income class - 23%

  3. Find the sample size for the given standard deviation 10 and the standard error with respect of sample mean is 3.

  4. A die is thrown 9000 times and a throw of 3 or 4 is observed 3240 times. Find the standard error of the proportion for an unbiased die. .

  5. The standard deviation of a sample of size 50 is 6.3. Determine the standard error whose population standard deviation is 6?

  6. Explain in detail about sampling error.

  7. Explain in detail about non-sampling error.

  8. State any three merits of stratified random sampling.

  9. Using the following Tippet’s random number table.

    2952 6641 3992 9792 7969 5911 3170 5624
    4167 9524 1545 1396 7203 5356 1300 2693
    2670 7483 3408 2762 3563 1089 6913 7991
    0560 5246 1112 6107 6008 8125 4233 8776
    2754 9143 1405 9025 7002 6111 8816 6446

    Draw a sample of 10 three digit numbers which are even numbers.  

  10. A wholesaler in apples claims that only 4% of the apples supplied by him are defective. A random sample of 600 apples contained 36 defective apples. Calculate the standard error concerning of good apples.

  11. A sample of 1000 students whose mean weight is 119 lbs(pounds) from a school in Tamil Nadu State was taken and their average weight was found to be 120 lbs with a standard deviation of 30 lbs. Calculate standard error of mean.

  12. A sample of 100 items, draw from a universe with mean value 4 and S.D 3, has a mean value 63.5. Is the difference in the mean significant at 0.05 level of significance?

  13. Write short note on sampling distribution and standard error.

  14. Explain the procedures of testing of hypothesis

  15. Determine the standard error of proportion for a random sample of 500 pineapples was taken from a large consignment and 65 were found to be bad.

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