anonymous
  • anonymous
I'm reading a research article and am having trouble understanding the following.. "Regardless of whether the book was written by a new or established author, being positively reviewed significantly increased sales; a positive review generated between a 32% and 52% increase in demand (no significant difference between coefficients, z = 1.0, p > 0.30)." What does the z here refer to?
Statistics
jamiebookeater
  • jamiebookeater
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jim_thompson5910
  • jim_thompson5910
z is the standard z-score
jim_thompson5910
  • jim_thompson5910
the way z is often computed is this \[\Large z = \frac{x-\mu}{\sigma}\]
jim_thompson5910
  • jim_thompson5910
mu is the mean, sigma is the standard deviation

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