In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds? Assume that we want 96% confidence that the error is no more than 4 percentage points.

Q: What is one example of systematic error that can occur in an experiment and one example of random…

A: The difference between true value and an measured value of an experiment is known as errors. If any…

Q: In a laboratory, a student calibrates a 25 mL pipette to use throughout a semester. She accidentally…

A: Generally this breakage happens. So if this happened she should pay the fine according to…

Q: Standard deviation is an indication of the... a. precision of one measurement b. accuracy of one…

A: Standard deviation:a number which is used to inform how measurements for a group are spread out from…

Q: 15. In preparing a certain ointment, a pharmacist used 28.35 grams of zinc oxide instead of the 31.1…

A: Given, mass of zinc oxide (used) = 28.35 g mass of zinc oxide (required) = 31.1 g

Q: how do i know if my measurement is significantly different from the exact value, at least 2…

A: Given: Exact value : 0.25 Average = 0.223 Standard deviation = 0.025 RSD = 11.2 %

Q: Use the formulas below and the data in the table to fill in the empty spaces in the table. (Apply…

A: The equations we will be using in filling the tables are  1) Area = Length X Width

Q: A measurement of the mass of a specimen was determined to be 4.203 +- 0.001 g. What is fractional…

A:

Q: Accuracy and precision are two important factors to consider when taking data measurements and they…

A: Accuracy and precision are two important factors to consider when taking data measurements and they…

Q: Convert 563 cm/s to units of meters per minute. Show the unit analysis by dragging the conversion…

A: Given, 563 cm/s  To convert it into m/min we must know conversion factors.

Q: Which of the following is incorrect: a. General steps in quantitative analysis include: Method…

A: A multiple choice question based on chemical analysis, which is to be accomplished.

Q: why is statistics itself is important in the field of chemistry especially in analytical chemistry?…

A: Answer:

Q: Which of the following sentence is correct: O Gross errors result from carelessness and the…

A: The given options describe different types of errors like gross error, random error etc., and…

Q: If the readings are 2 3 4 the average deviation is----- O 5.33 O 3.34 O 2.44 0.66

A: Calculate average deviation of the data, 2,3,4

Q: Suggest two sources of systematic error and two sources of random error in measuring the width of a…

A: Error in a measurement is observed when the true measurement value differs from the measured value.…

Q: Give two examples of the Instrumental Error (one of the classification of systematic error). Please…

A: Instrumental errror is a type of error that occurs due to the poor calibration or inaccuracy of…

Q: What is the uncertainty in a measurement of 0.39 mm?

A:

Q: A certain data set has low accuracy, but high precision. Which of the following statements about…

A: There is very little random and systematic error. Because random error causes one measurement to…

Q: Does standard deviation give a measure of precision or accuracy?

A: Interpretation - Does standard deviation give a mesure of precision or accuracy -      Introduction…

Q: You have measured the mass of samples A,B,C,D, and E on the analytical balances in our chemistry…

A: ∵ Standard deviation S=ΣXi-X2n-1Where ,         X=sample average         Xi=Individual values in…

Q: A 1.00 m long beam of stainless steel with a square 2.00 cm times 2.00 cm cross section has a mass…

A: Since density of any metal is given by  Density = mass of metal / volume of metal

Q: How are systematic method errors detected?

A: Systematic method error is a kind of systematic error. It will have a different calculated mean…

Q: For a set of 4 measurements, the precision of the data is calculated by: a. Standard deviation b.…

A: For a set of 4 measurements the precision of the data is calculated by

Q: How are systematic errors detected?

A: Systematic method error is a kind of systematic error. It will have a different calculated mean…

Q: A standard sample of pooled human blood serum contains 42.0 g of albumin per liter.Laboratory X…

A: Precision is the reproducibility of measurements where accuracy is the closeness of measured value…

Q: Which one of the following does not come under the category of systematic error? (A) Instrumental…

A: Indeterminate error does not come in the category of systematicc error. Instrumental error come due…

Q: The following statements are correct regarding errors except: O Detection of systematic method error…

A: There is one incoorect statement in the given 5 statements . We have to tell that incorrect…

Q: Systematic error causes the mean of a data set to differ from the accepted value. True…

A: The objective of measurement can be qualitative or quantitative. Every measurement has an inherent…

Q: #2 12.99 12.99 12.99 31.30 3770 3853 24.31 24.71 25.54 24.85 15] Mass of empty Beaker 16] Mass of…

A: Density is defined as mass of substance contained in per unit volume of that substance. Its unit is…

Q: The density of an irregular shaped object was measured three times with the following results: 2.15…

A: Standard deviation: The dispersion of a group measured values from the average value can be known by…

Q: Is the precision of your two trials within 5 %?. Support your answer with calculations

A: In order to analyze the precision of an experiment, we calculate the Percent relative standard…

Q: What is the percentage uncertainty with the following measurement 0.100 ± 0.005 g? Provide your…

A: Given:  0.100 ± 0.005 To find: The percentage uncertainity of the given measurement

Q: Which of the following sentence is correct: O Random errors cause outliers O Random error affects…

A: Errors are the deviation from the correct value.  Errors can be of different types, like random…

Q: The standard solution is prepared by dissolving a known mass of zinc pellets with conc. HCl. The…

A: Given information, Volume (V) = 250 mL = 0.25 L Mass of Zn (m) = 0.9809 g Molecular weight of the…

Q: [8.47 (+0.06)]3 = absolute uncertainty: percent relative uncertainty: + log [6.56 (+0.05)] =…

A: In this question we have to calculate the absolute uncertainty and percent relative uncertainty.…

Q: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m=…

A: Data given:  The mass of bacterial cell, m = 1.10 fg = 1.10×10–15 g (1 fg = 10–15 g)  m = 1.10×10–18…

Q: A method of analysis yields masses of gold that are low by 0.5 mg. This method is used for analysis…

A:

Q: The measurements were recorded and then repeated six times for two different methods, each giving:…

A: Given: The sample mean, sample standard derivation ,and sample size 1st method are χ1¯ =42 , s1 =0.3…

Q: A student calibrated a eudiometer by first recording the mass of the empty eudiometer followed by…

A: The density of water at 220C is 0.9978 g/mL

Q: I measured a line that was 8.4 centimeters which is the same as 3.375 inches. How do I calculate the…

A: The relative percentage error is equivalent to the algebraic ratio between the difference measured…

Q: An intensive property is one which does vary with the amount of substance, such as volume. does not…

A: Generally intensive property does not scale with system size.

Q: A loss of 0.4 mL of Zinc occurs in the course of an analysis to determine that element. Calculate…

A: Given that in an experiment involving Zn there is a loss of 0.4 mg of Zn. We need to calculate the…

Q: Define the unit of variance?

A: Unit of variance  Variance is the average of the squared distances from each point to the mean.  the…

Q: Give two examples of the Method error (one of the classification of systematic error). Please do not…

A: Method error is caused by the defects in the exoerimental methods.

Q: The Calcium content of a banana sample was homogenized and measured. Are the results comparable? Do…

A: Analytical chemistry is the branch of chemistry which deals with determination of constituents of a…

Q: level of uncertainty

A: LEVEL OF UNCERTAINITY

Q: In determining the density of a rectangular wooden block, use the information in the table below and…

A: Concept introduction: Density of the substance is equal to the ratio of mass to volume. Formula:…

Q: The mass of a compound is taken 5 times with the following results: 26.6mg, 26.3mg, 26.2mg, 26.4mg,…

A: First, the mean of the given result is determined.