During one semester of a healthy living class taught at Hope College, students w

Question

During one semester of a healthy living class taught at Hope College, students were weighed under water (in kilograms). This was done at the beginning of the semester and again at the end of the semester. The data can be found here: http://bcs.wiley.com/he-bcs/Books?action=mininav&bcsId=10008&itemId=1118172140&assetId=405213&resourceId=39871&newwindow=true

Copy and paste URL then click on Chapter 7 "Water weight" to view the data above.

A. Draw inferences based on the data (significance estimation)

Explanation / Answer

Result of data : -

since p-value is 6*10^(-11) , which is really very small

p-value < alpha

hence we reject the null and conclude that weight after end of semester is different from that before the semester

in fact there is significant evidence that weight after end of semester has increased from that before the semester

t-Test: Paired Two Sample for Means Variable 1 Variable 2 Mean 2.558988764 2.745505618 Variance 1.765370723 1.743736749 Observations 178 178 Pearson Correlation 0.963619661 Hypothesized Mean Difference 0 df 177 t Stat -6.962850924 P(T<=t) one-tail 3.14037E-11 t Critical one-tail 1.653508002 P(T<=t) two-tail 6.28074E-11 t Critical two-tail 1.973457202

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