MATH 302_Week 5Test_Q3_Q4 Attempt1

Which statement is true?   Question 12 options:    Precision is measured by standard deviation.   Precision is measured by error or relative error.   Accuracy is measured by the standard deviation.

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Using a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron solution[0.25g/L] into a 500mL volumetric flask. Then, using a 10mL pipette you transfer a 4mL aliquot of this solution into a 50mL volumetric flask and dilute up to the mark. Calculate the % uncertainty.   Question 1 options:   0.65   0.75   0.0075   0.45

Suppose that in a random selection of 100 colored candies, 25% of them are blue. The candy company claims that thepercentage of blue candies is equal to 24%. Use a 0.05 significance level to test that claim.Identify the null and alternative hypotheses for this test. Choose the correct answer below.

I am struggling with finding tcalc, I know it is not 1.64

Perform the calculations and determine the absolute and percent relative uncertainty. Express each answer with the correct number of significant figures. To avoid rounding errors, do not round your answers until the very end of your calculations. [9.8 (±0.3) — 2.31 (±0.01)] 8.5 (+0.6) = absolute uncertainty: + 0.76 Incorrect percent relative uncertainty: 0.88 + 86.36 Incorrect 9.2 (+0.4) × ([5.4 (±0.3) × 10−³] + [5.6 (±0.1) × 10-³]) = Incorrect %

3. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is a. 500 mg​​ b. 250 mg c. 60 mg 4. The method described above is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed a. -0.1% b. -0.8%

There are three types of error in the laboratory: random error, systematic error, and gross error. Elaborate how can you use standard deviation and percent error in identifying the errors made in the measurement.

During a titration experiment, 50.00 mL of a certain solution needs to be transferred to an Erlenmeyer flask. To measure the volume, a student used a calibrated 10-mL pipette five times. If the pipette delivers an actual volume of 9.98 mL with an uncertainty of ±0.02 mL, what will be the uncertainty in the final volume?

Based on this. What was the percentage error in the percentage of water in the sample, compared to pure MgSO4•7H2O?

A sample ore is found to be 0.0015% gold and 0.0034% copper. What is the percentage of matter in the ore that is neither gold nor copper? Round your answer to the nearest ten thousandth

Which scale is most useful for reporting data from the spectrometer? Why?

please highlight the correct answer

A meter of polyaramide fiber has a diameter of  450.μm , a mass of  0.198g , and takes  0.25s  to produce on an industrial spinneret. How would you calculate the mass of fiber that can be spun in  55.min ? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.

The percentage of an additive in gasoline was measured six times with the following results: 0.13, 0.12, 0.16, 0.17, 0.20, and 0.11%. Find the 95% confidence interval for the percentage of additive.

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