Identify and explain the features of the normal distribution.

Identify and explain the features of the normal distribution
What is the difference between hypothesis testing and point estimation?
What is null hypothesis? Why is a null hypothesis called null? What is an alternative hypothesis? Why is an alternative hypothesis called alternative?
If you were to calculate a confidence interval using a confidence level of 0.9 and then calculated a second confidence interval using the same data, but change the confidence level to 0.95, would the interval be more narrow or wider? What is the reason?

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