Where Do You Buy Your Books Quiz
Hello! I am BACK! I will try my best not to give you all the answers but just help with some of the questions. But most likely I'll be giving out answers :P.
1. Which scatter plot shows a negative association and an outlier?
ANSWER: When something is positive, it goes up. When something is negative, it's going down. An outlier is when there's this small bit of dots far from all the other dots. Here's a hint: LOOK FOR THE ANSWER WHERE THE DOT IS VERYYY FAR!
2. Which statement correctly describes the association between hot chocolate sales and ice cream sales?
ANSWER: Take a look at the graph. Notice how for hot chocolate sales the higher the number is the farther the dots are going down? Look at your answers again and see which one fits best. What are the ice cream sales doing as the hot chocolate sales increase? Are the dots going down or up?
3. For each scatter plot, determine if the relationship shown is linear and positive, linear and negative or nonlinear.
ANSWER: Linear means extending in a straight OR nearly straight line. If the spots are scattered around they are most likely not linear. But look at the problems before, those dots on the graph are examples of a linear association. Refer back to what I've said before: what does it mean if the dots are going down? What does it mean if the dots are going up?
4. Which is a correct description of the data in the table?
ANSWER: Okay so this is going to be hard to explain LOL. The explanatory variable is the independent variable (x). It's what you manipulate or what changes. The response variable is what changes as a result of of the independent variable. Here's an example: Angela is growing plants in her backyard. She wants to determine how the same type of plants grow with the help of different fertilizers. The fertilizer is what changes, the plant growth changes depending on the fertilizer. I'm so sorry if that was a bad explanation!! So here's another similar one to your problem: Ben wants to know how much he will earn for working x amount of hours. Think about it...what does his amount of money depend on?
5. The scatter plot shows how many pages of a novel each of 8 students read and how much time they spent reading. Answer both parts a and b. A: What is the meaning of the point (35, 25)? B: Is the association between time and number of pages read positive or negative? State the association in terms of the variables.
ANSWER FOR PART A: Remember that (35,25) came from (x,y). X is horizontal (across) and y is vertical (up and down). What does x represent if you look on the graph? What does y represent if you look on the graph? I am going to pick a random point from the graph. (35,20). It looks like at 35 minutes, 20 pages have been read.
ANSWER FOR PART B: Refer back to the other problems you have answered. What does it mean when the dots on the graph are going up? What does it mean when they are going down? Some of you may be confused by "state the association in terms of variable" which I was too. How can you tell this is a negative or positive association, is basically what it's asking. You may find it helpful to go back question #2. This is also really hard to explain without giving you the answer!! But again you may find it helpful to go back to question #2!!
6. Twelve students were asked how long they spent doing homework last week. The scatter plot shows the results of the survey. Is there an outlier in the data set? If there is an outlier, identify it and explain why it is an outlier.
ANSWER: Refer back to what I've said about outliers. Some people may find the graph hard to read so here is the outlier: (11,2). But make sure to explain WHY this an outlier or HOW YOU KNOW it's an outlier.
7. Eric works in a restaurant. Sometimes he clears tables. The scatter plot shows how much he earned in tips by clearing tables on different days. Based on the scatter plot, which of the following is true? Select all that apply.
This one is hard to explain without give you the answer so: A and D.
8. Mark recorded the growth of a plant over 8 weeks. The equation
y=0.2x+2 represents the height y, in inches, after x weeks.
ANSWER: To solve this plug some of the numbers in the answers into the given equation. I recommend putting this equation into the calculator in the website called Mathpapa as it will better explain how they got the answer rather than me.
9. Alexa created the line of best fit shown for the data points graphed. Is the line a good representation for this data? Explain your reasoning.
ANSWER: A good line of best fit will not ignore too many points, and will have an equal amount of points above and below. Take a look at the line. Is it ignoring too many points? Is there an equal amount above and below?
10. Consider the scatter plot shown. Which shows the line of best fit? Explain your reasoning.
ANSWER: I'll just straight out say this right now. Line 1 is not the best line of fit. So take a look at the other lines. Where is line 3? Is it close to as many points as possible? Is it too far above or too far below the points? What about line 2? This should help you answer it.
Again, I am so sorry if this was not helpful. I've tried to explain it in a way I would want others to explain it to me when I needed help. Fortunately for my gradebook, I got 100% on this quiz so I am positive the answers I've given to you are correct. Hope this helped you and I'm sorry if it didn't! For extra help also make sure to look at the resources your teacher has given to you. They are usually helpful on the Quiz. Video reviews and such. Unfortunately I am not allowed to post links. So I recommend that you go to the math is fun website and look up the definition of line of best fit. I would also recommend go to khan academy and and look for the vid that says "Interpreting trend line" or something along that. Also look for one that says estimating line of best fit. As much as I hate khan academy (for some strange reason it just irks me the wrong way) these videos were very helpful!
Goodbye for now!
3 answers