Answer:
c. the variance of the difference scores is near zero
Step-by-step explanation:
If all the participants show improved performance of 8 or 9 points after treatment, what should the researcher find - the variance of the difference scores is near zero.
But this can be true only when the original scores had a low variance.
The answer is C and D. From the result, we can use this to represent the whole customer. But the percent calculation need to use the number of customers divided by total of 75, not 100.
Answer:
the organizers ordered 3200 tickets
Step-by-step explanation: