You read in a magazine that drinking a sugary drink is the best thing to give yo

Question

You read in a magazine that drinking a sugary drink is the best thing to give you an energy boost. You decide to lest this theory with the help of a friend. For 12 days, at the end of each day you ask your friend how many sugary drinks (if any) they hart that afternoon. You also ask how much energy they felt they had that afternoon, on a scale from 1 to 10. This is an example of a completely randomized experiment an observational study a double-blind experiment an uncontrolled experiment Suppose that based on some data we construct the least-squares regression line for predicting one variable y given another variable x. If we interchange the roles of x and y, then The correlation will change but the regression line will be unchanged. Both the correlation and regression line will be unchanged. Both the correlation and regression line will change. The regression line will change but the correlation will be unchanged. Approximately what percent of observations are above the third quartile? 0 % 25% 50% 75% 100%

Explanation / Answer

Question 3 :For option A: This is not completely randomized, since we have done this experiment only on a single friend whose selection from the people was more biased

Correct option is option D: uncontrolled experiment since I am not sure whether my friend is taking any sugary drink at the end of the day. Hence from the definition it follows that this is an uncontrolled experiment

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