Sections 6-3 to 6-5, Part 6: Example 3

Example 3: Sampling distribution of proportions (Teens and iPhones)
0:00 Turning numbers into letters
2:21 Calculating a sample proportion
3:42 Rule for normality
5:32 Mean and standard error
7:05 z-score of a sample
8:31 Percentile of a sample
11:26 P-value of a sample
11;49 Characterizing the sample as typical or significantly low