Below is a scatterplot. Note that time is in seconds and the date are period 196

Question

Below is a scatterplot. Note that time is in seconds and the date are period 1965 to 1995. Based on this plot, what conclusion can we draw? By 2015 the time will be well below 1500 seconds. About every decade, the time decreases by at least 100 seconds. About every decade, the time decreases by about 50 seconds None of the above. Concerning simple linear regression, if the sample correlation coefficient means that none of the variation in the response variable is explained by the 80 percent of the variation in the response variable is explained by 36 percent of the variation in the response variable is explained 64 percent of the variation in the response variable is explained A lurking variable is variable which is not explicitly measured but which affects the the true cause of a response. any variable that produces a large residual. the true variable which is explained by the explanatory variable.

Explanation / Answer

ANS

1-about every decade time decreased by 100 seconds

2-80 percent variation in response is explained by explanatory variable ,because of also all points fall around a straight line

3-the variable which is not measured but which affects the response variable

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