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Suppose two teams of researchers recruited participants and measured their math ability on a scale from  1 to 70. The first team sampled 30 participants; they obtained a sample mean of 50 and a 95% CI of [40, 60]. The second team sampled 40 participants; they obtained a sample mean of 55 and a 95% CI of [50, 60]. Which team's point estimation of the population mean is more precise.  A. First team B. Second team C. Both are the same.

Suppose two teams of researchers recruited participants and measured their math ability on a scale from  1 to 70. The first team sampled 30 participants; they obtained a sample mean of 50 and a 95% CI of [40, 60]. The second team sampled 40 participants; they obtained a sample mean of 55 and a 95% CI of [50, 60]. Which team's point estimation of the population mean is more precise.  A. First team B. Second team C. Both are the same.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Suppose two teams of researchers recruited participants and measured their math ability on a scale from  1 to 70. The first team sampled 30 participants; they obtained a sample mean of 50 and a 95% CI of [40, 60]. The second team sampled 40 participants; they obtained a sample mean of 55 and a 95% CI of [50, 60]. Which team's point estimation of the population mean is more precise. 

A.

First team

B.

Second team

C.

Both are the same.

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