# 2 survey 3 using the secondary date available and

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2. Survey . 3. Using the secondary date available and work on it.

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Hypothesis testing It is related to examine validity for the purpose of generalizing. It is the degree to which the conclusions in your study would hold for other persons in other places and at other times.
Sampling errors : The mistakes that occurred when you use the sampling method as a method of data collection called the sampling errors and can be divided into two types of errors: A. Random sampling error 1. Variation, especially when sample size is small than the required. 2. Those units which did not enter in the sample by chance . 3. The average size of sampling errors depends on: Sample size , diffusion of its terms , the method of selecting units

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Cont . B. Bias Error : is the average deviation of all estimates of community of the samples as possible on the real value of this parameter. There are three types of bias error (1) Error bias in the selection : (2) Error bias in the evaluation (3) Error bias resulting from the wrong definition. (4) Other errors are common in the samples: a) Non-response errors (not update the frame) b) Errors tag and data processing c) Printing Errors d) Errors clarification of the results
Recommendation : Determine the main problem accurately, Put clear and SMART objectives Prepare for the required tools and resources , Increase the sample size Ensuring that the sample adequately represents the entire population. Follow up and review results in milestones

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• Fall '19
• #, Dr. Samir Allam, Mervat Monier

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