Long Quiz 002 - (10)

Pls help ASAP.

20,18,2,4,15,15,10 Using these data, construct a 80% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal.  Construct the 80% confidence interval. Round your answer to one decimal place.

sub= 18 help

Categorize each as a determinate or an indeterminate error and further classify determinate errors as instrumental, method or personal. a) An unknown sample being weighed is hygroscopic. b) One component of a mixture being analyzed quantitatively by GC reacts with the column packing. c) A radioactive sample being counted repeatedly without any change in condition yields a slightly different count at each trial. d) The tip of the pipet used in the analysis is broken. e) In measuring the same peak heights of a chromatogram, two technician each report different heights.

In order to calibrate a pipet, you obtain the following data:   # of drops mL Trial 1 30 0.72 Trial 2 30 0.77 Trial 3 30 0.82 What volume in mL does your pipet deliver per drop?

Which of the following statements concerning calibration curves are true? 1. A plot of signal versus analyte amount or concentration  2. Measure the response of an instrument by first measuring the response from a standard  3. Used to calibrate a measurement over an extended range.   a. 1 only b. 1 an 2 only c. 1 and 3 only d. 2 and 3 only e. 1, 2, and 3

I need help finding the %Composition for %cychohexane and %toluene. The formula (area of peak/total area) * 100%

Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 27.Quality control department maintain and store records that represent the history of batch from start to finish a. Quality Coordinating office b. Analytical Laboratory d. Material Inspection Section e. Biological Testing Laboratory C. Specification & Analyrtical Development section 28. Which of the following cannot be assay by direct titration with standard base? Citric acid in calamansi juice a. Magnesium hydroxide in Milk of Magnesia C. Acetic acid in vinegar b. d. Diluted phosphoric acid 29. This is used for quantitative preparation of a standard solution: a. Pipet C. Volumetric flask b. Graduated cylinder d. Buret

Can you please fill the rest of tghe data based on the on inforamtion you have and  answer  Average concentratuon of NaOH  Standard deviation of concentration

Include all decimals #. Thank you

I need help finding the %Composition for %cychohexane and %toluene. The formula (area of peak/total area) * 100%

Provide an appropriate response. 12) The IQ scores of adults are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability that a randomly selected adult has an IQ score between 85 and 125.

"Precision" is the ___________ of a measurement a. probability b. repeatability c. variability d. exactness