12 Mid-Chapter Quiz

Do you know HOW?

Find each sum or difference.

1. [ − 2 3 0 4 − 1 1 ] + [ 4 − 1 3 0 − 3 2 ] . matrix with 3 rows and 2 columns , row1 column 1 , negative 2 , column 2 3 , row2 column 1 , 0 , column 2 4 , row3 column 1 , negative 1 , column 2 1 , end matrix . plus . matrix with 3 rows and 2 columns , row1 column 1 , 4 , column 2 negative 1 , row2 column 1 , 3 , column 2 0 , row3 column 1 , negative 3 , column 2 2 , end matrix
2. [ 0 − 2 3 1 − 4 3 ] − [ − 1 0 2 5 − 4 3 ] . matrix with 3 rows and 2 columns , row1 column 1 , 0 , column 2 negative 2 , row2 column 1 , 3 , column 2 1 , row3 column 1 , negative 4 , column 2 3 , end matrix . minus . matrix with 3 rows and 2 columns , row1 column 1 , negative 1 , column 2 0 , row2 column 1 , 2 , column 2 5 , row3 column 1 , negative 4 , column 2 3 , end matrix

Find each product.

3. − 2 [ 3 0 − 2 1 ] negative 2 . matrix with 2 rows and 2 columns , row1 column 1 , 3 , column 2 0 , row2 column 1 , negative 2 , column 2 1 , end matrix
4. 3 [ − 1 3 0 2 ] 3 . matrix with 2 rows and 2 columns , row1 column 1 , negative 1 , column 2 3 , row2 column 1 , 0 , column 2 2 , end matrix

Tell whether each histogram is uniform, symmetric, or skewed.

5. 
6. 
   Image Long Description
7. Gymnastics A gymnast's scores from his tryouts are listed below. Make a frequency table and a histogram that represent the data.

   8.8 9.1 3.5 6.9 7.3 9.6 9.0 5.7 7.2 4.3 8.9 9.5

8. Basketball A basketball player's points per game are listed below. Make a cumulative frequency table that represents the data.

   16 8 19 12 9 10 11 9 12 23 5 20 13 6 17

9. Music The hours per week that a school band practiced are listed below. What are the mean, median, mode, and range of their practice times? Which measure of central tendency best describes their practice times?

   7 5 9 7 4 6 10 8 5 7 8 7 3 12 15 13 8

Identify the minimum, first quartile, median, third quartile, and maximum of each data set. Then make a box-and-whisker plot of each data set.

10. daily visitors: 34 29 32 25 97 93 112 108 90
11. commute (mi): 8 33 28 7 42 9 30 38 22 6 37
12. Movies Of the ratings for ten movies, eight ratings are less than or equal to 7. What is the percentile rank of a rating of 7?

Determine whether each data set is qualitative or quantitative.

13. favorite books
14. prices of DVDs
15. Business A software business e-mails every thousandth name on an e-mail list to find out what software the people are using. Is the survey plan random, systematic, or stratified? Will it give a good sample? Explain.

Do you UNDERSTAND?

16. Reasoning When you compare two sets of data, will the set with the greater interquartile range always have the greater range? Explain and give an example.
17. Writing When is each measure of central tendency most useful?

18. Error Analysis A student wrote the matrix equation below. Describe and correct the mistake.

    

19. Open-Ended Describe a problem that you could solve by conducting a survey. Write an unbiased survey question, and explain how to choose a good sample for your survey.
20. Reasoning Which measure of central tendency would be most appropriate for qualitative data? Explain your answer.

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