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Mean iq of this population

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A psychology researcher who does work in creativity wants to determine whether her sample of 50-year-old adults (N = 150) differs statistically from the population of 50-year-olds in intelligence. For her sample, she calculates the following: Mean = 109, SD = 10. (Hint: By definition, the mean IQ of this population is 100 and the population standard deviation is 15. Another hint: Use the z-test here!) 

  • Null hypothesis:
  • Alternative hypothesis:
  • Statistical test:
  • Significance level (alpha = .05)
  • Critical region for rejecting null hypothesis:
  • Calculate the statistic:
  • Decision:

Reference no: EM132188421

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