MATH 120 WEEK 6 BOOK EXAM 2023 GRADED
A+ QUESTIONS & ANSWERS
1.
Based on the linear regression, how much would you expect a
0.55 carat diamond to cost?
$1,800
$2,100
$2,500
$2,900
2.
Based on the linear regression, how much would you expect a
diamond that costs $5,500 to weigh?
0.72 carats
0.78 carats
0.81 carats
0.90 carats
3.
You're surprised to learn that instead of ~$100, a 0.30 carat
costs ~$800 carats. Which explanation would make sense?
The linear regression is not accurate at predicting the cost of diamonds
below 0.40 carats.
There is a fixed cost associated with procuring the diamond and offering it for
sale, meaning that small diamonds have a relatively high price.
The diamond is very high quality as measured by other metrics (e.g., cut,
clarity, color).
All of the above.
4.
If a residual is negative, what does it mean about the observed
/
, value?
The predicted value is greater than the observed value.
The predicted value is equal to the observed value.
/
A+ QUESTIONS & ANSWERS
1.
Based on the linear regression, how much would you expect a
0.55 carat diamond to cost?
$1,800
$2,100
$2,500
$2,900
2.
Based on the linear regression, how much would you expect a
diamond that costs $5,500 to weigh?
0.72 carats
0.78 carats
0.81 carats
0.90 carats
3.
You're surprised to learn that instead of ~$100, a 0.30 carat
costs ~$800 carats. Which explanation would make sense?
The linear regression is not accurate at predicting the cost of diamonds
below 0.40 carats.
There is a fixed cost associated with procuring the diamond and offering it for
sale, meaning that small diamonds have a relatively high price.
The diamond is very high quality as measured by other metrics (e.g., cut,
clarity, color).
All of the above.
4.
If a residual is negative, what does it mean about the observed
/
, value?
The predicted value is greater than the observed value.
The predicted value is equal to the observed value.
/
