Probability that mean minutes of work is at least given time
Consider one city in a similar survey where the mean is working time is 508 minutes. Assume the standard deviation of 14 minutes. Cosider a group of 12 people. What is the probability that the mean minutes of work is at least 512?
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Assume the standard deviation of 14 minutes. Cosider a group of 12 people. What is the probability that the mean minutes of work is at least 512?
Explain the purpose of a null hypothesis. Why are both a research/alternative hypothesis and a null hypothesis necessary in statistics?
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SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points, and are approximately normally distributed. What SAT I score within the population would have a percentile rank of approximately 9
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