Does your doctor know? (part ) The table in Exercise 16 shows whether NEJM medical articles during various time periods included statistics or not. Were planning to do a chi-square test. a) How many degrees of freedom are there? b) The smallest expected count will be in the 1989/No cell. What is it? c) Check the assumptions and conditions for inference.
STAT 110 – Notes for Week of 9/20/16 Chapter 11 Continued o Stemplot: essentially a histogram turned on its side. It shows the exact values of a distribution. It is used for smaller distributions, since all of the values need to be listed. Also known as a stem-and-leaf plot. o Each observation is separated into a stem (all of the digits of a value except the last digit) and a leaf (the last digit of a value). o There is a line between each stem and the leaf; write each leaf to the right of each stem. For example, if you had the values 40, 42, 43, and 45, the stemplot would say: 4 | 0 2 3 5 . o You also use a stemplot to determine whether a distribution is skew