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Question 931  confidence interval, normal distribution

A stock's returns are normally distributed with a mean of 10% pa and a standard deviation of 20 percentage points pa. What is the 90% confidence interval of returns over the next year? Note that the Z-statistic corresponding to a one-tail:

  • 90% normal probability density function is 1.282.
  • 95% normal probability density function is 1.645.
  • 97.5% normal probability density function is 1.960.

The 90% confidence interval of annual returns is between:



Question 932  confidence interval, normal distribution

A stock's returns are normally distributed with a mean of 10% pa and a standard deviation of 20 percentage points pa. What is the 95% confidence interval of returns over the next year? Note that the Z-statistic corresponding to a one-tail:

  • 90% normal probability density function is 1.282.
  • 95% normal probability density function is 1.645.
  • 97.5% normal probability density function is 1.960.

The 95% confidence interval of annual returns is between:



Question 933  confidence interval, normal distribution

A stock has an expected return of 10% pa and you're 90% sure that over the next year, the return will be between -15% and 35%. The stock's returns are normally distributed. Note that the Z-statistic corresponding to a one-tail:

  • 90% normal probability density function is 1.282.
  • 95% normal probability density function is 1.645.
  • 97.5% normal probability density function is 1.960.

What is the stock’s standard deviation of returns in percentage points per annum (pp pa)?




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