In the description of the following experiment, determine the experimental factor. During a study testing a new vaccine for Zika virus, the research team grouped the volunteers enrolled for the test into Group A and Group B. Group A received an inert drug (placebo) while Group B received the vaccine.
Select the correct answer below:
whether or not a person contracts the Zika virus
the effectiveness of the new vaccine
the drug received by each group
the group receiving the new vaccine
In: Math
To evaluate the effectiveness of a new type of plant food developed for tomatoes, an experiment was conducted in which a random sample of 56 seedlings was obtained from a large greenhouse having thousands of seedlings. Each of the 56 plants received 80.5 grams of this new type of plant food each week for 9 weeks. The number of tomatoes produced by each plant was recorded yielding the following results: ?bar =31.08 . ?=4.325
A researcher has started with a new sample and a given degree of confidence that the average number of tomatoes the seedlings produced on the new plant food is between "35.64258 and 37.63742". Suppose the sample size and standard deviation are the same as given above. What alpha did the researcher use in the construction of this statement?
In: Math
The water used in this experiment is sparged with nitrogen to remove any dissolved oxygen. The proton-coupled reduction of oxygen is shown in the following half reaction:
O2 + 4 H+ + 4 e- = 2 H2O
a.Explain why sparging a solution with N2to remove dissolved oxygen is an equilibrium process.
b.Using the half reaction above, write the balanced equation for the reaction of ascorbic acid with oxygen. Show your work.
c.If you didn’t know whether or not O2is capable of oxidizing ascorbic acid, how would you determine this by consulting data? What data would you consult and what would you look for? (Simply trying the reaction is not an acceptable answer.)
In: Chemistry
In an experiment electrons are released with a kinetic energy of 2.8 eV. The amazing physicists doing the experiments are increasing the wavelength by 50%. Do you remember what happens? Are the photoelectrons faster or slower? The energy now is 0.44 eV.
A) Based on that information, what is the material of the cathode? (calculate the work function and compare to table 28.1 in our textbook).
B) What is the initial wavelength of the light?
C) When you go a few pages back in the textbook you can find out the temperature of a physical object radiating at that wavelength
In: Physics
An experiment was conducted to see the effectiveness of two
antidotes to three different doses of a toxin. The antidote was
given to a different sample of participants five minutes after the
toxin. Twenty-five minutes later the response was measured as the
concentration in the blood. What can the researchers conclude with
α = 0.01?
| Dose | |||
| Antidote | 5 | 10 | 15 |
| 1 | 0.6 1.1 1.1 |
2.1 1.5 6.2 |
3.1 4.1 5.9 |
| 2 | 1.1 1.2 1.1 |
1.7 1.3 1.5 |
2.1 3.1 2.1 |
a) What is the appropriate test statistic?
---Select--- na one-way ANOVA within-subjects ANOVA two-way
ANOVA
b) Compute the appropriate test statistic(s) to
make a decision about H0.
Antidote: critical value = ; test
statistic =
Decision: ---Select--- Reject H0 Fail to reject H0
Dose: critical value = ; test statistic
=
Decision: ---Select--- Reject H0 Fail to reject H0
Interaction: critical value = ; test
statistic =
Decision: ---Select--- Reject H0 Fail to reject H0
In: Math
I am working on a method section for a paper. The experiment in general terms is testing to see if there is a significance between two treatment groups in substance abuse recovery. One group is an exercise group the other is not. the sample population is about 100 individuals and 50 in each category. All individuals will be asked yes or no if they relapsed over the last year. What would be the best statistical analysis test for determining if this is chance or if there is significance.
In: Math
An experiment was conducted to see the effectiveness of two
antidotes to three different doses of a toxin. The antidote was
given to a different sample of participants five minutes after the
toxin. Twenty-five minutes later the response was measured as the
concentration in the blood. What can the researchers conclude with
α = 0.01?
| Dose | |||
| Antidote | 5 | 10 | 15 |
| 1 | 0.6 1.1 1.1 |
2.1 1.5 6.2 |
3.1 4.1 5.9 |
| 2 | 1.1 1.2 1.1 |
1.7 1.3 1.5 |
2.1 3.1 2.1 |
Compute the corresponding effect size(s) and indicate
magnitude(s).
Antidote: η2
= ; ---Select--- na trivial effect small
effect medium effect large effect
Dose: η2
= ; ---Select--- na trivial effect small
effect medium effect large effect
Interaction: η2
= ; ---Select--- na trivial effect small
effect medium effect large effect
d) Make an interpretation based on the
results.
There is an antidote difference in blood concentration.There is no antidote difference in blood concentration.
There is a dose difference in blood concentration.There is no dose different in blood concentration.
There is an antidote by dose interaction in blood concentration.There is no antidote by dose interaction in blood concentration.
In: Math
A factorial experiment was designed to test for any significant differences in the time needed to perform English to foreign language translations with two computerized language translators. Because the type of language translated was also considered a significant factor, translations were made with both systems for three different languages: Spanish, French, and German. Use the following data for translation time in hours.
| Language | |||
| Spanish | French | German | |
| System 1 | 7 | 14 | 14 |
| 11 | 18 | 18 | |
| System 2 | 9 | 14 | 19 |
| 13 | 16 | 25 | |
Test for any significant differences due to language translator system (Factor A), type of language (Factor B), and interaction. Use = .05.
| Source of Variation | Sum of Squares | Degrees of Freedom | Mean Square | F | p-value |
| Factor A | |||||
| Factor B | |||||
| Interaction | |||||
| Error | |||||
| Total |
In: Math
. Which of the following is NOT CORRECT about a randomized complete block experiment?
(a) Every block is randomized separately from every other block.
(b) Every treatment must appear at least once in every block.
(c) Blocking is used to remove the effects of another factor (not of interest) from the comparison of
levels of the primary factor.
(d) The ANOVA table will have another line in it for the contribution to the variability from blocks.
(e) Blocks should contain experimental units that are as different as possible from each other.
In: Math
A factorial experiment was designed to test for any significant differences in the time needed to perform English to foreign language translations with two computerized language translators. Because the type of language translated was also considered a significant factor, translations were made with both systems for three different languages: Spanish, French, and German. Use the following data for translation time in hours.
| Language | |||
| Spanish | French | German | |
| System 1 | 6 | 11 | 10 |
| 10 | 15 | 14 | |
| System 2 | 5 | 18 | 14 |
| 9 | 20 | 20 | |
Test for any significant differences due to language translator system (Factor A), type of language (Factor B), and interaction. Use = .05.
| Source of Variation | Sum of Squares | Degrees of Freedom | Mean Square | F | p-value |
| Factor A | |||||
| Factor B | |||||
| Interaction | |||||
| Error | |||||
| Total |
In: Math