I want formula please

\""55\"" 13 A clinic compared healthy dogs it owned with healthy pets brought to clinic to be neutered. The summary Tries remaining: statistics for blood cholesterol levels (milligrams deciliter of blood) appear In the followrng table: 3 Marked out of Types n Average Standard deviation 3-00 Pets (P) 61 193 66.8 F Flag Clinic (C) 61 181 44.9 \"\"35\"\" Difference (d = P - C) 61 12.0 48.9 (a) Find an 80% confidence interval for the difference in mean blood cholesterol levels dogs brought to the clinic (P) and dogs owned by the clinic (C). (Round your answers to 4 decimal places, if needed.) ( i ) (b) Based on this confidence interval, can we conclude there is some differences in mean blood cholesterol levels between the two groups? Yes, since the intenral contains 0. No, since the interval is completely abOve 0. No, since the interval centains 0. " Yes, since the interval is completely above 0. Check