Statistics
1. what is the sum of all the results included in the sample divided by the number of observations. it is the average.

2. total data set

3. this is the collection, display, and analysis of the data

4. this is asking or inquiring people's opinion

5. this is the most frequently occurring element in a set

6. this measures the deviation between the scores and the mean, it mesures how dispersed the data is. the higher this is the more spread out the data is from each other.

7. the type of sample in which each member of the sample set or group has equal chance of being chosen

8. the spread of the middle 50% of the data

9. the middle term in a set of data. if the data set has an even number of terms this is the average of the two middle terms.

10. this is the process of gathering data from every member of a population

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution