R A researcher found that the IQ scores of the ALS students in the Division of Pangasinan II are normally distributed with a mean of 110 and a standard deviation of 10. 1. How many ALS students are needed to test so that the estimate will not be more than 5 from the population mean with a 99% level of confidence? 2. Due to the limited contact with ALS students, the researcher tested a small numbers of ALS students. Explain the effect of this small sample on the estimate of the parameter. 3. What must be done to the sample size to reduce the margin of error of the confident interval estimate?

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