Assingment 2

course Mth 173

±ýוǂ¬à{å±­©øäù“{«Ÿ¡ï²å€assignment #002

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002.

09-23-2007

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23:20:10

`qNote that there are four questions in this assignment.

`q001. Recall the stock value problem, where March, July and December values were $5000, $5300 and $5500.

Construct a graph of stock value vs. number of month (e.g., 1 for Jan, 2 for Feb, etc.). You will have three points on your graph, one corresponding to the March value, one to the July value, and one to the December value. Stock value will be on the y axis and month number on the x axis. Your first point, for example, will be (3, 5000), corresponding to $5000 in March.

Connect your three points with straight lines--i.e., connect the first point to the second and the second to the third.

What is the slope of your line between the first and second point, and what is the slope of your line between the second in the third point? Recall that slope is rise / run.

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RESPONSE -->

4/300 is the first and the second is 5/200

confidence assessment: 2

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23:21:55

The three points on the graph are (3, 5000), (7, 5300) and (12, 5500).

The rise between the first point and the second is from 5000 to 5300, or 300, and the run is from 3 to 7, or 4, so the slope is 300 / 4 = 75. Note that the 300 represents $300 and the 4 represents 4 months, so the slope represents $300 / (4 months) = $75 / month, which is the average rate of change during the first time interval.

The rise between the second point and the third is from 5300 to 5500, or 200, and the run from 7 to 12 is 5, so the slope is 200 / 5 = 40. This slope represents the $40/month average rate of change during the second time interval. Click on 'Next Picture' to see the graph.

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RESPONSE -->

I was right on my points and also was right on the rise and run but i didnt know i had to divide it like that so i got it now but i knew the answer

self critique assessment: 2

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23:24:11

`q002. Look at your results for the slopes, and look the results for the average rates of change. What do you notice? In what way then does the graph represent the average rate of change?

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RESPONSE -->

it gets steeper is all i can think of

confidence assessment: 1

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23:24:31

We see from this example that the slope of a graph of value vs. clock time represents the rate at which value is changing with respect to clock time.

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RESPONSE -->

self critique assessment: 0

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Your response did not agree with the given solution in all details, and you should therefore have addressed the discrepancy with a full self-critique, detailing the discrepancy and demonstrating exactly what you do and do not understand about the given solution, and if necessary asking specific questions (to which I will respond).

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23:29:53

`q003. To what extent do you think your graph, consisting of 3 points with straight line segments between them, accurately depicts the detailed behavior of the stocks over the 9-month period?

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RESPONSE -->

it is going in a pattern but i really dont understand this question so i would say it is just going to stay consistent

confidence assessment: 1

You should have self-critiqued the solution.

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23:31:05

`q004. From the given information, do you think you can accurately infer the detailed behavior of the stock values over the nine-month period?

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RESPONSE -->

yeah

confidence assessment: 1

That is not a valid response. 'Yes' or 'no' or 'true' or 'false' or any response chosen from a small list of possible responses must always be justified.

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23:31:43

Not on a day-to-day basis, and not even on a month-to-month basis. All we can see from the given information is what might be an average trend.

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RESPONSE -->

that means over time we could tell the change or the consistents

self critique assessment: 1

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In general you need more detail in your solutions and more attention to self-critique.

I would suggest repeating this exercise.