Chapter Five Flashcards
(7 cards)
1
Q
Standard Normal Distribution
A
Has a mean of 0 and a standard deviation N(0,1) denoted by z
2
Q
Central Limit
A
For random samples with a sufficiently large sample size, the distribution of many common sample statistics can be approximated with a normal distribution
3
Q
Z- score formula
A
Sample statistic - null parameter / standard error
4
Q
Confidence interval formula
A
Sample stat +/- z* x SE
5
Q
Z*
A
Multiplier chosen so the proportion between -z* and z* is the desired level of confidence
6
Q
Empirical rule
A
68% of data contained in 1 st dev of the mean
95% in two
99.7% in three
7
Q
Z* multiplier values
A
90%: 1.645
95%: 1.96
99%: 2.576
