Question

1) In a problem, what lets you know to use the Empirical Rule 68% - 95%- 99.76? Remember, Empirical Rule is a shortcut for X-Z-Table problems and X -Z-Table problems. 2) What key word(s) in a problem tell you to use the Normal Distribution X~ N (4, o)? 3) What key word(s) in a problem tell you to use The Sampling Distribution of the Sample Mean X~ N

Answer 1

SolutionA:

Empirical rule can be applied if given sampling distribution xbar follows normal distribution

SolutionB:

X is a random variable

N is a notation that follows normal distribution

with mean=$\mu$

and standard deviation=$\sigma$

SolutionC:

X bar sample mean

N says follows normal distribution

with sample mean=xbar

and sample standard deviation=

o/sqrt(n)