问题


There is a single choice question about high school statistics. Answer the question by replying A, B, C or D.
Question: Data were collected on two variables X and Y and a least squares regression line was fitted to the data. The estimated equation for this data is y = –2.29 + 1.70x. One point has x = 5, y = 6. What is the residual for this point?
A. 7.91
B. 6.21
C. 0.21
D. –0.21
Answer:

答案

模型 模型答案 正确答案
金声玉亮2.0 To find the residual for the point (5, 6), we need to calculate the predicted value of y using the regression line equation and then subtract the actual value of y from it.

The equation is y = –2.29 + 1.70x.

For x = 5, the predicted y is:
y = –2.29 + 1.70(5) = –2.29 + 8.5 = 6.21

The actual y value is 6.

The residual is the actual y value minus the predicted y value:
Residual = y - predicted y = 6 - 6.21 = -0.21

Answer: D. –0.21
D
deepseekr1

The residual is calculated as the observed y minus the predicted y. Using the regression equation \( y = -2.29 + 1.70x \), the predicted y when \( x = 5 \) is:

\[
\text{Predicted } y = -2.29 + 1.70(5) = -2.29 + 8.50 = 6.21
\]

The observed y is 6, so the residual is:

\[
\text{Residual} = 6 - 6.21 = -0.21
\]

**Answer:** D
D
gpto1 D D
GPT-4o To calculate the residual for the given point, we follow these steps:

1. **Predict the value of y** using the regression equation \( y = -2.29 + 1.70x \) when \( x = 5 \):
\[
\hat{y} = -2.29 + 1.70(5) = -2.29 + 8.50 = 6.21
\]

2. **Calculate the residual**: The residual is the difference between the observed value of y and the predicted value \( \hat{y} \):
\[
\text{Residual} = y - \hat{y} = 6 - 6.21 = -0.21
\]

So, the residual for this point is \(-0.21\).

Answer: D. –0.21
D
llama3.1-70B-Instruct

To find the residual for the point (x = 5, y = 6), we need to use the estimated equation y = –2.29 + 1.70x to calculate the predicted value of y for x = 5, and then subtract this predicted value from the actual value of y.

First, calculate the predicted value of y for x = 5:

y = –2.29 + 1.70(5)
y = –2.29 + 8.50
y = 6.21

Now, subtract the predicted value from the actual value of y to find the residual:

Residual = Actual y - Predicted y
Residual = 6 - 6.21
Residual = –0.21

The residual for the point (x = 5, y = 6) is –0.21.

Answer: D
D
llama3.1-405B-Instruct

To find the residual for the point (x = 5, y = 6), we first need to calculate the predicted value of y using the given regression equation, which is y = –2.29 + 1.70x.

Plugging in x = 5 into the equation gives us:

y = –2.29 + 1.70(5)
y = –2.29 + 8.50
y = 6.21

The predicted value of y for x = 5 is 6.21.

The residual is the difference between the actual value of y and the predicted value of y. In this case, the actual value of y is 6, and the predicted value of y is 6.21.

Residual = Actual y - Predicted y
Residual = 6 - 6.21
Residual = -0.21

Therefore, the residual for the point (x = 5, y = 6) is -0.21.

The correct answer is D.
D
DeepSeek-Coder-V2 C. 0.21 D
Qwen2-72B-Instruct To find the residual for the point (5, 6), we need to find the value of y predicted by the regression line when x = 5, and then subtract the actual y value from this predicted value.

The predicted value of y when x = 5 is:

y = –2.29 + 1.70 * 5 = –2.29 + 8.5 = 6.21

The residual is then:

residual = actual y - predicted y = 6 - 6.21 = -0.21

Therefore, the answer is D. –0.21.
D
baichuan4 To find the residual for the given point, we need to plug in the x-value (5) into the equation of the line (y = –2.29 + 1.70x) and then subtract the actual y-value (6) from the predicted y-value.

Predicted y = –2.29 + 1.70(5) = –2.29 + 8.5 = 6.21

Residual = Predicted y - Actual y = 6.21 - 6 = 0.21

So, the correct answer is C. 0.21.
D
doubao D. First find the predicted value of y when x = 5: y = -2.29 + 1.70 * 5 = 6.21. The residual is the actual y value minus the predicted y value, so 6 - 6.21 = -0.21. D
minimax To find the residual for the point (x = 5, y = 6), we need to calculate the difference between the actual y-value and the predicted y-value from the regression equation.

The predicted y-value using the regression equation y = –2.29 + 1.70x for x = 5 is:

y = –2.29 + 1.70 * 5
y = –2.29 + 8.50
y = 6.21

The actual y-value is 6. The residual is the difference between the actual y-value and the predicted y-value:

Residual = Actual y - Predicted y
Residual = 6 - 6.21
Residual = -0.21

So the residual for this point is –0.21.

The correct answer is D. –0.21.
D
kimi To find the residual for the point (x = 5, y = 6), we first need to calculate the predicted y-value using the regression equation:

y = –2.29 + 1.70x

Substituting x = 5:

y = –2.29 + 1.70(5)
y = –2.29 + 8.50
y = 6.21

Now, the residual is the difference between the observed y-value and the predicted y-value:

Residual = Observed y - Predicted y
Residual = 6 - 6.21
Residual = –0.21

So, the correct answer is:

D. –0.21
D
wenxinyiyan D. -0.21

Explanation:
The residual for a point is the difference between the actual y-value and the predicted y-value based on the regression equation.

Given the regression equation $y = -2.29 + 1.70x$ and the point $(x, y) = (5, 6)$, we first need to find the predicted y-value using the regression equation.

Predicted $y = -2.29 + 1.70 \times 5 = -2.29 + 8.5 = 6.21$

Now, we calculate the residual by subtracting the predicted y-value from the actual y-value.

Residual $= 6 - 6.21 = -0.21$
D
zhipu To find the residual for the point \((x = 5, y = 6)\), we need to follow these steps:

1. **Calculate the predicted value of \(y\) using the regression equation**:
\[
\hat{y} = -2.29 + 1.70x
\]
Substituting \(x = 5\):
\[
\hat{y} = -2.29 + 1.70 \times 5 = -2.29 + 8.50 = 6.21
\]

2. **Calculate the residual**:
The residual is the difference between the actual value of \(y\) and the predicted value \(\hat{y}\):
\[
\text{Residual} = y - \hat{y} = 6 - 6.21 = -0.21
\]

So, the residual for this point is \(-0.21\).

Therefore, the correct answer is:
D. –0.21
D
gpto1 D D
deepseekv3 To find the residual for the given point, we need to follow these steps:

1. **Calculate the predicted value of \( y \) using the regression equation.**
The regression equation is \( \hat{y} = -2.29 + 1.70x \).
For \( x = 5 \):
\( \hat{y} = -2.29 + 1.70(5) \)
\( \hat{y} = -2.29 + 8.50 \)
\( \hat{y} = 6.21 \).

2. **Find the residual.**
The residual is the difference between the observed value of \( y \) and the predicted value of \( y \).
Given \( y = 6 \):
Residual \( = y - \hat{y} \)
Residual \( = 6 - 6.21 \)
Residual \( = -0.21 \).

Thus, the residual for this point is **–0.21**.

Answer: **D**.
D