A researcher conducted a research at a local high school wherein she found out that, among the 150 random the average number of respondents, texts sent is 135 with a sample standard deviation of 30. The population mean is 140. Use 1% level of significance. Find the z-value.

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A: n1=80n2=100 x1=32x2=14 p1=3280=0.4 p2=14100=0.14 q1=1-p1=1-0.4=0.6 q2=1-p2=1-0.14=0.86

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