An environmental scientist developed a new analytical method for the determination of cadmium (cd^2+) in mussels. to validate the method, the researcher measured the cd^2+ concentration in standard reference material (srm) 2976 that is known to contain 0.82 plusminus 0.16 ppm cd^2+. five replicate measurements of the srm were obtained using the new method, giving values of 0.782, 0.762, 0.825, 0.838, and 0.761 ppm cd^2+. calculate the mean (bar x), standard deviation (s_x), and the 95% confidence interval for this data set. at list of t values can be found in the student's t table. x bar = s_x = 95% confidence interval = x bar plusminus does the new method give a result that differs from the known result of the srm at the 95% confidence level?

The method is accurate  in the calculation of the

Explanation:

As a first step we have to calculate the average concentration of find it by the method.

Then we have to find the standard deviation:

For the confidence interval we have to use the formula:

μ=Average±

Where:

t=t student constant with 95 % of confidence and 5 data=2.78

μ=  ±  

upper limit:  0.84

lower limit: 0.75

If we compare the limits of the value obtanied by the method (Figure 1 Red line) with the reference material (Figure 1 blue line) we can see that the values obtained by the method are within the values suggested by the reference material. So, it's method is accurate.

no statements shown

the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl