Iq test and their z-score and p-value

Reference no: EM13104231

The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the sample was 103.

- What is Ho? What is Ha?

- What is the Z-score? What is the P-value?

- Is the result significant at the 5% level? Why or why not?

Reference no: EM13104231

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