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Topic 6 - Sampling ll (in Hindi)
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Talvir Singh
JRF Qualified | Motivational Speaker | Comedy Addict | Lyricist | 5 Year Teaching Experience |Youtuber | Unacademy Top Educator

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thank you sir for great info u gave ! i already have joined mahendra's and regularly give speed test.. although i am not that great but i sometime manage to crack 1000 rank, sometime 2000.. but mostly i bag around 2500 rank. my 3rd year of graduation is going on.. i am b.sc ZBC student . i am really reallybad at general awareness and maths ! i regularly give mahendras test whenevr they upload new test to the portal! is that reliable or may i need to upgrade ? if yes then which one ? i will appear in 2018 exam. please suggest me test series if any . thank you
esa lagta he ki exams hamara nahi..aapka he..itni jyada dedication and responsibilities sayad koi de sake hame...
thanks sir for the help
thanks so lots sir apki teaching mathod bahot accha h AP bahot hi easly sare concept clear KR dete h thankuuu sir ☺ ☺
thank you sir mere sare doubt clear ho gaye
thank A lot sir ji ap to jo quality content de rhe hai koi aor nhi de payega
  1. TARGET JRF 2018 LAST MINUTE REVISION 30 MOST IMPORTANT TOPICS PAPER 1 TARGET 80+


  2. PROBABILITY SAMPLING


  3. 4534 34 91 04 04 ,91 95 78 64 95 17 65 49 65 Sample Population Probability Sampling


  4. Probability Sampling *Each and every unit of the population has the equal chance for selection as a sampling unit *Also called formal sampling or random sampling *Probability samples are more accurate Probability samples allow us to estimate the accuracy of the sample


  5. Types of Probability Sampling *Simple Random Sampling *Stratified Sampling Cluster Sampling Systematic Sampling Multistage Sampling


  6. Simple Random Sampling The purest form of probability sampling Assures each element in the population has an equal chance of being included in the sample Random number generators


  7. *With replacement The unit once selected has the chance for again selection *Without replacement The unit once selected can not be selected again


  8. Advantages of SRS Minimal knowledge of population needed External validity high; internal validity high; statistical estimation of error Easy to analyze data


  9. Disadvantage High cost; low frequency of usee Requires sampling frame Does not use researchers' expertise Larger risk of random error than stratified


  10. Stratified Random Sampling Population is divided into two or more groups called strata, according to some criterion, such as geographic location, grade level, age, or income, and subsamples are randomly selected from each strata Elements within each strata are homogeneous, but are heterogeneous across strata


  11. Advantage * Assures representation of all groups in sample population needed Characteristics of each stratum can be estimated and comparisons made Reduces variability from systematic


  12. Cluster Sampling The population is divided into subgroups (clusters) like families. A simple random sample is taken of the subgroups and then all members of the clusterselected are surveyed.


  13. Systematic Random Sampling


  14. Multistage Random Sampling Multistage sampling refers to sampling plans where the sampling is carried out in stages using smaller and smaller sampling units at each stage. Not all Secondary Units Sampled normally used to overcome problems associated with a geographically dispersed population


  15. Pri Clusters Secondary Clusters Simple Random Sampling within Secondary Clusters 3 3 5 6 5 8 9 10 1 6 8 13 14 15 9 10