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- First image contains the respective absorbance readings of the samples specified in the 96-well plate set-up in the 2nd image . The absorbance reading that needed to be write should be the average absorbance of 12 - replicate analysis (i.e. Calculate the average of the absorbance of A1 to A12 to get the final absorbance of the "blank".Answeer the question, hypothesis, prediction, and state the independent vari able, dependent, controlled, control group, experimental design, and treatment groupIdentification of an organism requires that you do every test that you have previously learned. Identification of an organism requires that you do every test that you have previously learned. True False
- A Researcher decided to put students into groups based on their Cumulative Weighted Averages and had four different groups. He then systematically selected one student from each group and assigned some clear roles and responsibilities. Here, the researcher used ……………………..in selecting the students. a.Simple random samplingb.Cluster random samplingc.Stratified random samplingd.Two stage cluster samplinge.Convenience sampling In a short sentence each, explain THREE of the sampling types indicated in the options aboveA regression line is a straight line which: a. is defined by an equation having 2 parameters: the slope and the intercept b. is parallel to one of the coordinate axes c. provides an inverse relationship between the values of two parameters d. is the asymptote of the sampling equationIn an experiment, the control group is used to: a Change the variable b Provide a baseline for comparison with the test group c add additional non-dependent variables d demonstrate correlation rather than causation e generate hypotheses
- If 80% of drunk drivers fail to pass a sobriety test (walking a straight line for 5 meters) in 60 seconds, while only 10% of sober drivers fail to pass this sobriety test in 60 seconds, then this test has: a specificity of 90%, and a sensitivity of 80% a specificity of 10%, and a sensitivity of 20% a specificity of 20%, and a sensitivity of 90% a specificity of 10%, and a sensitivity of 80% a specificity of 20%, and a sensitivity of 10%Why is it important to have control experiments in addition to the tests being conducted? a.To determine if there was unwanted contamination. b.To determine if experiment yielded an expected result. c.Neither A or B are correct. d.Both A and B are correct.1) Chi-square analysis generates a p value, an important indicator of statistical support for a hypothetical outcome. If a p value = 0.05 > p > 0.01, the tested hypothesis fails to be falsified. Agree/Disagree? Answer with explanation here:
- A control group is _______. a. a set of individuals that have a certain characteristic or receive a certain treatment b. the standard against which an experimental group is compared c. the experiment that gives conclusive resultsIdeally, an experimental group differs from a control group (a) only with respect to the hypothesis being tested (b) because its subjects are more reliable (c) in that it is less subject to bias (d) in that it is less vulnerable to sampling error (e) only with respect to the variable being studiedPeacock Butterfly Predator Defenses The photographs below represent the experimental and control groups used in the peacock butterfly experiment discussed in Section 1.6. See if you can identify the experimental groups and match them up with the relevant control group(s). Hint: Identify which variable is being tested in each group (each variable has a control). A Wing spots painted out B Wing spots visible; wings silenced C Wing spots painted out; wings silenced D Wings painted but spots visible E Wings cut but not silenced F Wings painted, spots visible; wings cut, not silenced Peacock butterfly experiment A With wings folded, a peacock butterfly resembles a dead leaf, so it is appropriately camouflaged from predatory birds. B When a predatory bird approaches, a butterfly flicks its wings open and closed, revealing brilliant spots and producing hissing and clicking sounds. C Researchers tested whether the wing-flicking and sound-making behaviors of peacock butterflies affected predation by blue tits (a type of songbird). Experimental Treatment Number of Butterflies Eaten Wing spots concealed 5 of 10 (50%) Wings silenced 0 of 8 (0%) Wing spots painted out and wings silenced 8 of 10 (80%) No treatment 0 of 9 (0%) Proceedings of the Royal Society of London, Series B (2005) 272: 12031207. D The researchers painted out the spots of some butterflies, cut the soundmaking part of the wings on others, and did both to a third group; then exposed each butterfly to a hungry blue tit for 30 minutes. Results support only the hypothesis that peacock butterfly spots deter predatory birds. FIGURE 1.12 Testing the defensive value of two peacock butterfly behaviors.
