Statistics for Decision-Making

Statistics – Lab Week 2 Math221 Statistical Concepts:  Using MINITAB  Graphics  Shapes of Distributions  Descriptive Statistics  Empirical Rule Data in MINITAB  MINITAB is a powerful, yet user-friendly, data analysis software package. You can launch MINITAB by finding the icon and double clicking on it. After a moment you will see two windows, the Session Window in the top half of the screen and the Worksheet or Data Window in the bottom half.  Data have already been formatted and entered into a MINITAB worksheet. Go to the eCollege Doc sharing site to download this data file. The names of each variable from the survey are in the first row of the Worksheet. This row has a background color of gray to identify it as the variable names. All other rows of the MINITAB Worksheet represent a certain students’ answers to the survey questions. Therefore, the rows are called observations and the columns are called variables. Included with this lab, you will find a code sheet that identifies the correspondence between the variable names and the survey questions.  Complete the answers below and paste the answers from MiniTab below each question. Type your answers to the questions where noted. Therefore, your response to the lab will be this ONE document submitted to the dropbox. Code Sheet Variable Name Question Drive Question 1 – How long does it take you to drive to the school on average (to the nearest minute)? State Question 2 – What state/country were you born? Temp Question 3 – What is the temperature outside right now? Rank Question 4 – Rank all of the courses you are currently taking. The class you look most forward to taking will be ranked one, next two, and so on. What is the rank assigned to this class? Height Question 5 – What is your height to the nearest inch? Shoe Question 6 – What is your shoe size? Sleep Question 7 – How many hours did you sleep last night? Gender Question 8 – What is your gender? Race Question 9 – What is your race? Car Question 10 – What color of car do you drive? TV Question 11 – How long (on average) do you spend a day watching TV? Money Question 12 – How much money do you have with you right now? Coin Question 13 – Flip a coin 10 times. How many times did you get tails? Die1 Question 14 – Roll a six-sided die 10 times and record the results. Die2 Die3 Die4 Die5 Die6 Die7 Die8 Die9 Die10 Creating Graphs 1. Create a Pie Chart for the variable Car – Pull up Graph > Pie Chart and click in the categories variables box so that the list of variables will show up on the left. Now double click on the variable name ‘Car” in the box at the left of the window. Include a title by clicking on the “Labels…” button and typing it in the correct text area (put your name in as the title) and click OK . Click OK again to create graph. Click on the graph and use Ctrl+C to copy and come back here, click below this question and use Ctrl+V to paste it in this Word document.

MATH | 221 | Statistics for Decision-Making | lab | Statistics – Lab Week 2 Math22

y = -31.737x + 0.4668   Points Received: 0 of 8   Comments: ( T C O 9 ) A r e s e a r c h e r f o u n d a s i g n i f i c a n t r e l a t   i o n s h i p b e t w e e n a s t u d e n t ’ s I Q , a , t h e g r a d e p o i n t a v e r a g e , b , a n d t h e s c o r e , y , o n t h e v e r b a l s e c t i o n o f t h e S A T t e s t . T h e r e l a t i o n s h i p c a n b e r e p r e s e n t e d b y t h e m u l t i p l e r e g r e s s i o n e q u a t i o n y = 2 5 0 + 1 . 5 a + 8 0 b . P r e d i c t t h e S A T v e r b a l s c o r e ( t o t h e n e a r e s t w h o l e n u m b e r ) o f a s t u d e n t w h o s e I Q i s 1 3 0 a n d g r a d e p o i n t a v e r a g e i s 2 . 2 . Student Answer:  625   621 (Ch 9: y = 250 + (1.5 * 130) + (80 * 2.2))   421   371   Points Received: 0 of 8   Comments: ( T C O 9 ) I n t e r p r e t a n r v a l u e o f 0 . 9 2 .   Student Answer:  strong negative correlation   weak negative correlation   strong positive correlation (Chapter 9)   no correlation   Points Received: 3 of 3   Comments: Page: 1   2   Page: 1   2   1. Id en tif y th e cl as s wi dt h.   Student Answer:     Instructor Explanation: Chapter 2: (2 pts) The class width is 4; (2 pts) the midpoint of the ﬁrst class is 9.5; (2 pts) the class boundaries are 7.5 - 11.5; (4 pts) the relative frequencies are (18/158 = 0.1139), (23/158 = 0.1456), (38/158 = 0.2405), (47/158 = 0.2975), (32/158 = 0.2025)   Points Received: 0 of 10   Comments: ( T C O 3 ) T h e n u m b e r s o f h o m e r u n s t h a t S a m   Student Answer:  1. Stem/Leaf 0/4 1/0,5 2/5 3/3,6 4/0,9 5/0 6/3,4,6 2. 35.61 3. 36 4. 4,8,10,15,25,33,36,40,49,50,63,64,66 = no mode (there is not a number that repeats) 5. 62 6. 487.25 7. 22.07  Instructor Explanation: Chapter 2: (5 pts) The stem-and-leaf should look like this: 0 | 4 8 1 | 5 0 2 | 5 3 | 3 6 4 | 9 0 5 | 0 6 | 6 3 4 (1 pts) The mean is 35.6. (3 pts) The median is 36 (1 pts) There is no mode. (1 pts) The range is 62 (3 pts) The variance is 449.775 (using population formula since it is every single year of the ﬁrst 13 years) (1 pts) The standard deviation is 21.2   Points Received: 7 of 10   Comments: Page: 1   2  

MATH | 221 | Statistics for Decision-Making | assessment | y = -31.737x + 0.4668   Points

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