One important test for kidney disease involves measuring the levels of bicarbonate (HCO3) in blood. Normal bicarbonate levels for a person ranging in age from 18 to 59 years old is 2329 mmol/L. A lab purchased a new instrument to measure bicarbonate levels in blood and needs to certify it against their current instrument. The bicarbonate levels in the blood of a 38 year old woman was measured using the old and new instrument. The blood was tested 6 times using each instrument. The mean concentration of bicarbonate using the old instrument was found to be 24.4 mmol/L with a standard deviation of 1.54 mmol/L. The new instrument yielded a mean concentration of 25.4 mmol/L with a standard deviation of 0.48 mmol/L. Determine if there is a significant difference in the standard deviations of the two sets of measurements made by the two instruments at the 95% confidence level. Determine the value of Fcalc. 1.1247 Fcalc = Incorrect Determine the value of Ftable. Refer to the table of critical values of F as needed. 1.87485 Ftable A student measured the lead content of a paint sample 4 times. The standard deviation of the measurements was found to be 0.75% of the average. Calculate the confidence interval at the 90% confidence level. confidence interval: + % Can this student be 90% confident that the true value is within 0.95% of the measured average? no yes