In the z-score formula, which of the following is true if the value in the numerator is a negative value? A) the xi value lies to the left of the mean
B) the mean is of lesser value than the xi value
C) the mean is of negative value
D) the numerator value cannot be divided by the standard deviation

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .