Question: The data in the table below were obtained during a determination of lead in lake water by atomic absorption spectrometry (show calculations for the following

The data in the table below were obtained during a determination of lead in lake water by atomic absorption spectrometry (show calculations for the following questions)

Lead concentration, mg/L
0.0
2.0
4.0
6.0
8.0
10.0

Absorbance, A
0.002
0.150
0.294
0.434
0.570
0.704

a. Assuming a linear relationship between the variables, find the least-squares estimates of the slope and intercept. What is the equation of the line? (answer in slope-intercept form, y=mx+b)
b. What are the standard deviations of the slope and intercept?
c. What is the standard error (SE) of the estimate?
d. What is the concentration (mg/L) of lead from a water sample with an absorbance of 0.413.

Step by Step Solution

★★★★★

3.46 Rating (153 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a xy 0002 0C00004 O15 03 O0225 4 0086436 16 0294 0434 4 1176 6 26... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Chemistry Questions!

The data in the table below were obtained during a colorimetric determination of glucose in blood serum. Glucose concentration, mM Absorbance, A...

The carbon steels listed in the table below were soaked at 1000 C for 1 hour to form austenite and were cooled slowly, under equilibrium conditions to room temperature. Refer to the Fe-Fe3C phase...

The data in the table below represent time study observations for a woodworking operation. a. Based on the observations, determine the standard time for the operation, assuming an allowance of 15...

Guess the value of the limit by evaluating the function f(x) = x2/2x for x = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 50, and 100. Then use a graph of to support your guess lim 2'

An immersed electrical heater is used to raise the temperature of a liquid from 20?C to 60?C in 20.0 mm. The combined mass of the liquid and the container is 250 kg, and the mean heat capacity of the...

After being cut from a large single-crystal boule and polished, silicon wafers undergo a high-temperature annealing process. One technique for heating the wafer is to irradiate its top surface using...

Figure is a graph of v versus t for a particle moving along a straight line. The position of the particle at time t = 0 is x 0 = 5m. (a) Find x for various times t by counting squares, and sketch x...

Based on the following graph (which summarizes the demand, marginal revenue, and relevant costs for your product), determine your firm??s optimal price, output, and the resulting profits for each of...

Determine the present worth in year 0 of the cash flows shown at an interest rate of 15% peryear. Year 1 2 3 4 5 6 7 8 9 10 Cash Flow, $ 90 90 90 85 80 75 70 65 60 55

Refer to Example 8.5. In example a. Apply the Kruskal-Wallis test to determine if there is a difference in the distributions of pain reduction for the three analgesics. b. Does your conclusion differ...

Company Abel has total sales of $364,500, of which, $60,500 represent cash sales. Its annual average accounts receivable balance is $74,400. What is its accounts receivable turnover in terms of days?...

Add Assigned Service Industry Recent labor productivity, unit labor costs, and related data Employment (thousands) Percent change: INSERT YEARS Labor productivity Unit labor costs Output Hours worked...

c). You want to write a simple model to understand some of the determinants of the likelihood of getting unemployed during an upcoming economic recession. Assume you have the following information...

In today's increasingly VUCA (Volatile, Uncertain, Complex and Ambiguous) world, it is important for firms to be able to quickly and accurately adapt to shifts in the marketplace or changes in...

Concept of Value Chain. The phrase "value chain" refers to all of the commercial activities and procedures that go into making a product or providing a service. A value chain can include all stages...

Calculate the following expressing all answers in lowest terms: 1. 777 = 2. 3 3-3 3. Find the first derivative: f(x) = 4x + 7 4. Find the first derivative: h(x) = 2 5. Find the first derivative: g(x)...

Create a formula in cell H 5 to calculate the taxable pay. Multiply the number of dependents by the deduction per dependent and subtract that from the gross pay. With two dependents, Spencer s...

Evaluate the integral, if it exists. Jo y(y + 1) dy

Explain which is more stable, cis-1, 2-dimethylcyclopropane or trans-1, 2-dimethylcyclopropane.

Show a free energy versus reaction progress diagram for the following reaction: HCI+ NH3 CI + NH4

Explain why deuterium is lost in preference to hydrogen in this Hofmann eliminationreaction: *N(CH)3 D. H. + (CH)N + HOD

Given the following null and alternative hypotheses H0: p1 p2 0.0 HA: p1 p2 0.0 and the following sample information Sample 1 Sample 2 n1 60 n2 80 x1 30 x2 24 a. Based on a 0.02 and the...

The following dependent samples were randomly selected. Use the sample data to construct a 95% confidence interval estimate for the population mean paired difference. Sample 1 Sample 2 Sample 1...

The following samples are observations taken from the same elements at two different times: Unit Sample 1 Sample 2 1 15.1 4.8 2 12.3 5.7 3 14.9 6.2 4 17.5 9.4 5 18.1 2.3 6 18.4 4.7 a. Assume that the...