Use the data set posted on Canvas in the “Data Files” module called “Chapter_2_Quiz_Data.xlsx” to complete this assessment. This data set is a set of score from an exam taken by a College Algebra class. The variable "Exam_Score" is a quantitative variable - the student's score out of 100 points.

What is the lower quartile, Q1, for the exam score data?

Question

Use the data set posted on Canvas in the “Data Files” module called “Chapter_2_Quiz_Data.xlsx” to complete this assessment. This data set is a set of score from an exam taken by a College Algebra class. The variable "Exam_Score" is a quantitative variable - the student's score out of 100 points.

What is the lower quartile, Q1, for the exam score data?

BlackTom AI · Accepted Answer

The task presents a data analysis question about finding the lower quartile, Q1, for the Exam_Score data from the given data set.
First, recall what Q1 represents: it is the 25th percentile of the data, the value below which 25% of observations fall.
Since this is a numerical data set of exam scores, you would typically:
- sort all Exam_Score values from smallest to largest,
- determine the position corresponding to the 25th percentile (often using N+1 as a basis or using the method that defines quartiles by splitting the ordered data into quarters),
- read off the value at that percentile, or interpolate between surrounding data points if the exact percentile lies between observations.
In this particular assessment, the answer provided for Q1 is 66.5. This implies that, according to the data set’s distribution, the value around which roughly 25% of scores are at or below is 66.5.
Why 66.5 could be correct: if the data set has a value or an interpolation point at 66.5 when identifying the first quartile by the chosen quartile calculation method, it reflects the cutoff below which a quarter of the scores fall. If there are discrete scores, interpolation between two adjacent scores that straddle the 25th percentile can yield a non-integer like 66.5.
Why a different number could occur under other conventions:
- Some methods use the inclusive or exclusive approach to define the lower half when N is odd, which slightly changes the quartile calculation.
- Different software packages use slightly different formulas (e.g., using p*(N+1) vs p*N, or selecting the median of the lower half with or without including the overall median).
- If you apply a simple count approach (sort, then take the value at position floor(0.25*(N+1)) or ceil(0.25*N)), you might land on a neighboring score rather than 66.5 unless interpolation is performed.
In summary, given the data and the method used in the dataset’s solution, 66.5 is identified as Q1, representing the 25th percentile of Exam_Score. The core concept is that Q1 marks the cutoff below which roughly a quarter of the scores fall; any slight variation in quartile calculation methods could shift the exact numeric value, but with the provided dataset and method, 66.5 is the intended Q1.

STAT 130-007 Chapter 2 Quiz

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