During an experiment, readings for blood pressure in a person’s body were found to be constant. However, when measured by a different blood pressure cuff, the readings differed by 15 pointsfor each reading. This difference indicates that the results are
but not

During this experiment, readings for blood pressure were constant for a person, however, when with a different blood pressure cuff, the readings differed by 15 points for each reading. This difference indicates that the results are reliable  but not valid.

In this experiment readings of the blood pressure of a person are consistent in the right construct but with different cuff, every time shows the difference in readings more or less 15 points.

• this difference is due to the different cuffs so these differences are reliable but not valid.
• The measure can be valid but not reliable if it is measuring the right construct, but not doing so in a consistent manner.
• validity and reliability are independent

Thus, the difference indicates that the results are reliable  but not valid.

Learn more about validity vs. reliability.: