College students tested to see how well knowing a person affects the ability to detect a lie from that person. To do this, the students came up with 10 statements about a person in the group. Five of these statements were true and five were false. The group tried to make up statements that nobody (not even close friends) would know were true or false. The students then presented these statements to people that fit in three groupsclose friends, acquaintances, and complete strangersand counted how many statements each person correctly identified as true or false. Group Sample Size Mean SD Close Friends (C) 27 6.1 1.50 Acquaintances (A) 31 4.8 1.58 Strangers (S) 28 4.9 1.51 The Mean Group Diff statistic for this data set is 0.867. If the Mean Group Diff statistic had been smaller than the observed Mean Group Diff statistic, how would the strength of evidence change? Cannot be determined. The strength of evidence against the null would increase. The strength of evidence against the null would stay the same. The strength of evidence against the null would decrease