MATH 116 Lecture Notes - Lecture 5: Simple Random Sample, Statistical Parameter, Binomial Distribution
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Mat 121: elementary statistics and probability- lecture 16: estimating a population. : p-hat= the estimate point for p" (population proportion), usually unknown. If 30 students from your class were asked about test number 3 and 18 think that the test was easy. What then, is the sample proportion of students who think that the test was easy? p-hat= x/n p-hat= 18/30. 883 americans were surveyed and 380 responded that the economy is getting better. What is the sample proportion? p-hat= x/n p-hat= 380/883. Con dence level: (cl) is the probability 1- (alpha. expressed as a percent, typically 90%, 95%, or 99%) that the con dence interval contains the parameter, equation: If p-hat= . 02 and sample size equals 200. Find the number the number of successes (x). 200* . 02 = x/200 * 200 p-hat= x/n. 02= x/ 200 x=4: the ci of a proportion p", based on a sample, is the interval given by p-hat-e < p < p-hat+e.
