![]() On June 1, 2005, the Gallup Organization ( released results of a poll in which 372 of 1004 adults aged 18 years or older stated that they had “a great deal” of confidence in public schools. In 1995, 40% of adults aged 18 years or older reported that they had “a great deal” of confidence in the public schools. n ≤ 0.05 ⋅ N, where n is the sample size and N is the size of the population.The sample was obtained through a simple random sample process. ![]() ![]() The following 3 conditions need to be met: In order for the sampling distribution of a sample proportion p̂ to be approximately normal with mean μ = p̂ and standard deviation Our main goal is in finding the probability of a difference between a sample mean p̂ and the claimed value of the population proportion, p 0. Using Confidence Intervals to Test Hypotheses Hypothesis Test for a Population Proportion
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