Answer:
The mean exam scores in the second section is greater than the mean exam scores in the first section
Step-by-step explanation:
Here, we are interested in making a conclusion.
Mathematically;
z-score = (score - mean)/SD
so basically, what determines the sign of the z-score is dependent entirely on the mean.
If the mean is larger than the score, we will have a negative z-score. If the mean is smaller than the score, then will have a positive z-score
So basically what drives the sign is the mean value since the scores are the same for both students in this case, irrespective of the standard deviation in both classes.
So, for the first girl with a positive z-score, we can conclude that her score is larger than the mean; while for the second girl with a negative z-score, her score is smaller to the mean.
Thus, what we conclude here is that the mean score of the second section with the professor is greater than the mean score of the first section with the professor.
<span>C. The people in the study walked an average of 48.1 minutes each day.
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Yes because if you simplify both of the ratios they are equal.
For girls it is 30 to 12, which simplified (divided by 3) is 10 to 4 (divided by 2) is 5 to 2
For boys it is 40 to 16 which simplified (divided by 4) is 10 to 4 (divided by 2) is also 5 to 2. Therefore they are both equal.