Advanced Search Abstract Aims Normal exercise echocardiography predicts a good prognosis. Dobutamine stress echocardiography DSE is generally reserved for patients with comorbidities which preclude exercise testing.
The scientist then compared the mass of a known volume of the nitrogen sample m1 with that of the same volume of pure nitrogen m2 under the same set of conditions.
The experiment was repeated a number of times. It was found that m1 was consistently greater than m2. Which of the following gases is likely to be present in the nitrogen obtained to account for the result that m1 is greater than m2?
Which of the following statements best accounts for this phenomenon? Both ammonia molecule and water molecule are polar. Ammonia molecule and water molecule are of comparable sizes. Ammonia undergoes ionisation in water. NH3 g A question on structural isomerism Q. Understand the recent progress in industrial processes such as the production of vitamin C to solve problems of inadequate or shrinking supply of natural productsbrine spent brine conc.
Do you agree with this statement? Principle and experimental techniques Calculation on chemical stoichiometryQuestion No. Chemistry in Daily Life 1 Q. Meetthedemand Producingsomethingmoreusefultomankind 4Commentsonstudents performance ii Typeofreactioninvolved Wellanswered.
II CarriedoutatpH4to66Commentsonstudents performance iii Studentsshouldnotethatenzymes areselective denature atlowpH7Commentsonstudents performance iv Whygreener? Manufactureofchlorine,hydrogenandsodiumhydroxide12Commentsonstudents performance i Firstorderreaction?
Somefailedtorecognisethat largescalemanufactureofH2 g byelectrolysisofbrinewouldbringaboutsurplusCl2 g ,and thedisposalofwhichcouldposeotherenvironmentalproblems20Sample: Failuretoreadthequestioncarefully Expectedanswers Thermoset orsimilarmeaningsinsentences Crosslinkswithdiagramshowinghowthecrosslinkagescanbeformed32Sample: Thesamplemustnotbecontaminatedwithotherimpurities washwithdeionisedwater Thesamplemustbethoroughlydried inoven45Commentsonstudents performance ii percentagebymassofbariuminthesample.
Qualityofanswersdependsontheunderstandingofchemicalstoichiometry46Commentsonstudents performance iii TWOconditionsforgravimetricmethodsuitableforquantitativeanalysis Expectedanswers Completereaction Productshouldhaveadefinitecomposition Rateofreactionfastenoughtobepractical47Sample: They got 0 marks.
Ionic crystals is basic, simple molecular structure is acidic. Some students just used equations to answer the question so they could not get marks for communication.
Many correctly substituted the given data into the equilibrium expression but were unable to arrive at the correct answer.
Some had difficulty in giving the correct units to the final answer.The choice of statistical methods for analysis of test validation data from laboratory experiments and from evaluation of field-based samples depends on considerations such as the experimental design and sample selection (source, number of samples, number of replicates of tests, etc.).
All 82 patients underwent DSE, DSCMR, and invasive quantitative coronary angiography within 14 days. We compared the diagnostic accuracy of DSE, CMR cine imaging, the additive value of first-pass perfusion, and late gadolinium enhancement.
Davis: Statistical Methods for the Analysis of Repeated Measurements nonparametric delta method applied to the bootstrap Applied Nonparametric Statistical Methods, Fourth Edition, by P.
Sprent and N.
C. Smeeton, Boca Raton: Chapman & Dse . The results are shown in the table below. Test for a difference in distributions (medians) of the test scores for the different teaching methods using the Kruskal-Wallis test.
Method 1 94 87 90 74 86 97 Method 2 82 85 79 84 61 72 80 Method 3 89 68 72 76 69 65 1. O Scribd é o maior site social de leitura e publicação do mundo. The GraphPad guide to comparing dose-response or kinetic curves. Dr. Harvey Motulsky President, GraphPad Software Inc.
Statistical tests are often used to test whether the effect of an experimental regression (approach 1) or a more general method (approach 2), compare the curves using a t test.