A school district is deciding whether or not to adopt a new math curriculum. Thr

Question

A school district is deciding whether or not to adopt a new math curriculum. Three classrooms are randomly selected as test sites for the curriculum. To obtain a measure of student improvement, students in the three classrooms are tested on their math skills before and after the curriculum is implemented. The math skills test has 25 possible points. The post-implementation scores for the students in the third classroom are shown in the forming table: Calculate the sample size, n; the total sum, sigma x; and the sample mean, M. The school district decides it will to understand the score if they are converted to a 100-point scale. This requires that each score be multiplied by 4. Calculate the new n. sigma x. and M.

Explanation / Answer

Solution:

We have a table

19 13 16 18 15 14 17 8 20 19 22 11

Calculating the sample size, n; total sum X; and the sample mean, M for 25-point scale.

n = 12
X = 192
M = 16

Calculating the sample size, n; total sum X; and the sample mean, M for 100-point scale. This requires that each score be multiplied by 4.
So after multiplied by 4 the table will be

76 52 64 72 60 56 68 32 80 76 88 44

n = 12
X = 768
M = 64

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