P QUESTION 8 Let's say you calculated a 90% confidence interval for pulse rate of (51.6, 72.4) based on data from 25 people resting in a seated position. Choose the correct interpretation of this confidence interval. O a. We are 90% confident that the population mean pulse rate when seated is between 51.6 and 72.4 bpm O b. The probability that the population mean pulse rate when seated is between 51.6 and 72.4 bpm is 90%. O c. We are 90% confident that the population mean pulse rate for this sample of 25 people is in the interval 51,6 to 72.4 bpm O d. We are 90% confident that the mean pulse rate for these 25 people when seated is between 51.6 and 72.4 bpm QUESTION 9 You are studying weight gain for a dog food company. You measure the weight of 20 dogs in January and then measure the same dogs again in March to calculate the difference in weight (January - March = difference). Your 95% confidence interval for the difference in weights is (-2.23, 4.46). Select the correct interpretation of this confidence interval. O a. Dogs were heavier in January because the interval has more positive numbers in it O b. The dogs did not change in weight because the interval overlaps 0 O c. We cannot tell how much weight was gained or lost with only this information O d. Dogs were heavier in March because the interval has negative numbers in it