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Rajan.Sareen, Statistical Analysis-expert

Category: General

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Experience: M. Sc. with 4 years of expereince

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I need help. I'm trying to determine the likelihood of a

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I need help. I'm trying to determine the likelihood of a response in thresholds (ranges) given historical data. For example: On a survey that has a 100 data points, with a mean score of 60 and a standard deviation of 2 what are probabilities of us achieving a 70? Or 65? or 68? (Within what time frame?)

I am no mathematician can you explain in lehman's terms and tell me what Z value is? I'm assuming P = Probability and X = whatever number I'd trying to determine the probability of hitting that # ***** this scale?

Z is the standardized value of normal distribution. Z can be calculated as (X-Mean)/(SD/sqrt(n)) if we know the mean, standard deviation and n, we can find Z value so that we can calculate the probability. We have standardized value for Z known as standard normal probability tables. The table can be found from below link for corresponding value of Z: