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(t-test-one-sample x-bar sd n mu #:tails)procedure

Given observed data with mean x-bar, standard devation sd and number of observations n (n < 30), return the significance of the sample compared with the population mean mu. #:tails is one of:

  • ':both two-sided (default)
  • ':positive one-sided, x-bar >= mu
  • ':negative one-sided, x-bar <= mu