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Flashcards in Normal distribution and estimation statistics Deck (10)
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1

If the distribution is skewed, would you use mean, median or mode?

Median

2

Why do we want our data to be normally distributed?

Most statistical tests require it
It allows us to make predictions about data/make assumptions beyond sample data

3

What is needed to calculate the normal distribution?

Mean and standard deviation

4

How many SD is 95% probability? 99%?

2. 3.

5

How can you assess normality?

Visual assessment
Kurtosis/skewness within 1
Mean/median similar
Statistical tests

6

How do you calculate z-score?

(observed value - total mean) / standard deviation of sample

7

What is the z-score of 95% confidence? 99%?

1.96. 2.58.

8

How do you calculate standard error?

sd/sq.rt (pop.size)

9

How do you calculate margin of error?

z-score x SE

e.g. 1.96 x SE

10

How do you calculate confidence intervals?

(mean-MoE) - (mean+MoE)