help_people
  • help_people
A student is assessing the correlation between the average number of hours of internet browsing and average score on a math test for the students of a class. The table below shows the data: Number of hours of internet browsing (x) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Score on math test (y) 95 94 93 92 91 90 89 87 86 85
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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help_people
  • help_people
Part A: Is there any correlation between the average number of hours of internet browsing and average score on the math test for the students of the class? Justify your answer. Part B: Write a function which best fits the data. Part C: What does the slope and y-intercept of the plot indicate?
welshfella
  • welshfella
what do you think? as the number of hours on the internet increase what happens to the math score?
help_people
  • help_people
decrease?

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welshfella
  • welshfella
yes - and also decrease very much in line
welshfella
  • welshfella
for every 0.5 hour on the internet the math score goes down 1 point There is a definite negative correlation here.
welshfella
  • welshfella
there is just one exception to this rule - between 3 and 3.5 hours
welshfella
  • welshfella
where the mark drops by 2
help_people
  • help_people
ok?
help_people
  • help_people
so what would i say for pt a?
welshfella
  • welshfella
Just summarise the above - there's a definite negative correlation born out by the data.
welshfella
  • welshfella
for part B the function will be of the form y = mx + b y = mark and x = hours on internet where m is the slope of the graph of the function and b = value of the marks when the hours = 0, m will be negative
welshfella
  • welshfella
for every rise of 0.5 in hours mark decreases by 1 so m = -1/0.5 = ? and b = 95 ( the mark when x = 0)
welshfella
  • welshfella
can you figure out m now? -1 / 0.5 = ?
help_people
  • help_people
hold on srry
help_people
  • help_people
-2
help_people
  • help_people
@welshfella
welshfella
  • welshfella
right so our function is y - -2x + 95 and the graph will look like
help_people
  • help_people
whats the -- stand for
help_people
  • help_people
or is the function y= -2x + 95?
welshfella
  • welshfella
|dw:1436710595000:dw|
welshfella
  • welshfella
yes its y = -2x + 95 - typo
welshfella
  • welshfella
the y intercept represents the mark when hours on i nternet = 0 and the downward slope slows a negative correlation
welshfella
  • welshfella
|dw:1436710836539:dw|
welshfella
  • welshfella
* shows a negative correlation
welshfella
  • welshfella
I think you can call it a strong negative correlation.
help_people
  • help_people
this is what i put for pt c
help_people
  • help_people
The slope is a negative slope that also means negative correlation ( as the time on the internet goes up, scores go down). The y-intercept tells you the approximate score you expect when x=0 ( the score when you spend 0 hours on the internet).
welshfella
  • welshfella
Yes thats good
help_people
  • help_people
THANK YOU XOXO :)

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