Straight-Line Fit Questions | Prasnya
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Qualifier / Quiz 1
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Week 2
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Straight-Line Fit - Straight-Line Fit
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Q1
A small cafe records, over five days, the number of hours (
x
x
) a barista works and the corresponding number of drinks (
y
y
) sold: A simple linear regression model fitted to the data is
y
=
2
x
+
3
y = 2x + 3
. The total Sum of Squares Error (SSE) for all five observations is 10. It is known that, on the fifth day, the actual number of drinks sold exceeded the value predicted by the regression line. Determine, correct to the nearest integer, the number of drinks sold on the fifth day.
Integer answer
OCTOBER 26, 2025
OCTOBER 26, 2025
Q2
Suppose the line
y
=
2
x
+
5
y = 2x + 5
is the best fit line using SSE for the data set given in the table below. Find the value of SSE.
Integer answer
JULY 13, 2025
JULY 13, 2025
Q3
Radhika has been tracking her monthly expenses and the corresponding number of outings she has with friends. Here, let
y
y
represent the amount spent on entertainment and
x
x
represent the corresponding number of outings. She fitted a best-fit line to her data and obtained the equation. The best-fit line using SSE is
y
=
4
x
+
2
y = 4x + 2
. Find the value of SSE.
Integer answer
FEBRUARY 23, 2025
FEBRUARY 23, 2025
