The correct answer is d. we are 95% confident that a future value of temperature when wind is 6.8 and rh is 51 is between 15.67 and 17.16.
The interval reported for the first observation is a confidence interval for the mean temperature when wind is 6.8 and rh is 51.
This means that we are 95% confident that the true mean temperature for this combination of wind and rh is between 15.67 and 17.16 degrees Celsius.
The other answer choices are incorrect because they do not accurately reflect the meaning of the confidence interval.
Option a is incorrect because it refers to the mean temperature for all values of wind and rh, not just for wind = 6.8 and rh = 51.
Option b is incorrect because it refers to the slope of the relationship between temperature and wind, not the mean temperature.
Option c is incorrect because it is too broad of a statement. The confidence interval only applies to the specific combination of wind = 6.8 and rh = 51.