Theory of Sample Size Determination

Sample Size Determination:

The determination of sample size formula comes from the formulas for maximum error of the estimates. The formula is resolved for n. Be sure to round the answer obtained up to the next whole number, not off to the nearest whole number. If you round off, then you will exceed your maximum error of the estimate in some cases. By rounding off, you will encompass a smaller maximum error of the estimate than permitted; however this is better than containing a bigger one than desired.

Population Mean:

N = [(zα/2 σ)/E]2

The formula above for the sample size that is obtained by resolving the maximum error of estimate formula for the population mean for n.

Population Proportion:

N = [(zα/2)/E]2 pq

The formula above for the sample size that is obtained by resolving the maximum error of estimate formula for the population proportion for n. Some of the texts utilize p hat and q hat, however as the sample has not been taken, there is no value for sample proportion. p and q are taken from a prior study, if one is accessible. When there is no prior study or estimate accessible, then utilize 0.5 for p and q, as such are the values that will provide the maximum sample size, and it is better to encompass too large of a sample size and come beneath the maximum error of estimate than to encompass too small of a sample size and surpass the maximum error of the estimate.

Latest technology based Statistics Online Tutoring Assistance

Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Statistics help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Statistics, project ideas and tutorials. We provide email based Statistics help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Statistics. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Statistics Homework help and assignment help services. They use their experience, as they have solved thousands of the Statistics assignments, which may help you to solve your complex issues of Statistics. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.