Dr. Snow, is a drug researcher interested in investigating the mind-altering eff

Question

Dr. Snow, is a drug researcher interested in investigating the mind-altering effects of two very potent drugs, scotch and tequila. Specifically, Dr. Snow wonders, “Is there a difference between the two drugs in their mind-altering effects?” Wishing to minimize and effects due to physical differences in groups of subjects, he selects ten adult twin pairs to participate in his study (five mail twin pairs and five female twin pairs, obviously matched). One member of each twin pair is randomly assigned to one of two groups, such that one member of a twin pair is in the “scotch” group and the other member of the twin pair is in the “tequila” group. Then, using the famous Olson Mind Dazedness Test (OMDT) he measures each participant’s dazedness after self-administering three ounces of the drug within an hour’s time. Below are the dazedness scores of Dr. Mindfog’s experiment -- the higher the score, the more dazed the participant.

Group 1

Scotch

Dazedness Scores

Group 2

Tequila

E. 2.718

F. not listed

Twin Pairs

Group 1

Scotch

Dazedness Scores

Group 2

Tequila

Dazedness Scores Bob & Bubba 7 9 Fred & Frank 4 4 Tim & Tom 6 5 Mary & Madeline 5 8 Elvira & Evelyn 4 3 Juan & Jaime 4 8 Charla & Carla 9 10 Jim & John 8 9 Cindy & Sandy 5 8 Margaret & Marlene 3 4

Explanation / Answer

here as matched pair test is most suitable here for whcih degree of freedom =n-2= 10-1 =9

for 9 degree of freedom and 0.05 level critical value of t for two tailed test =2.262

option C is correct

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