Confidence interval of the mean
A study found that the average time it took a person to find a new job was 3.5 months. If a sample of 30 job seekers was surveyed, find the 90% confidence interval of the mean. Assume the standard deviation of the sample is 0.5 month.
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How much work does the electric field do in moving a proton from a point with a potential of +130 V to a point where it is -45 V? Express your answer in joules.
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The statistical procedure ensures that the alpha level for any given planned contrast will not exceed .05 is
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