Unit 7a: Normal Distribution

Question 1

Normal Distribution

Answer 1

symmetrical (each half mirrors the other)
* unimodal
* standard deviation about 1/6th of the range
* mean, median, and mode all have the same value
* theoretically- tails never actually touch the horizontal axis

Question 2

Standard deviation and normality:

Answer 2

Distribution of IQ scores (or most things you measure from people)

Question 3

68 95 99.7 rule

Answer 3

It says: 68% of the population is within 1 standard deviation of the mean. 95% of the population is within 2 standard deviation of the mean. 99.7% of the population is within 3 standard deviation of the mean

Question 4

how to calculate what proportion of scores will be in 68-95-99.7 rule

Answer 4

draw the normal distribution graph and sketch out the proportions