Confidence Interval

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Please help me to answer these questions thanks.

 

1-What are the characteristics of standard normal distribution? The HR department of an organization collects data on employees: age, salary, level of education, gender, and ethnicity. Which data do you think is more likely to follow normal distribution? Explain why

 

2-The Rule of Three generates a 95% confidence

interval. What rule would you recommend if

you wanted to have a 99.75% confidence

interval?

 

Why?

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