A: use control groups and experimental groups
B: use statistics to determine the effect of chance
C: control for the effects of extraneous variables
D: repeat the experiment using either identical or improved research methods
举一反三
- In designing an experiment, blocking is used A: to reduce variation B: to control the level of the experiment C: as a first step in randomization D: None of the above
- When comparing the means of three groups and above in population, we use A: t-test B: ANOVA C: Chi-square D: Rank test
- Which of the following is NOT to explain the methods? A: What is the research design? B: What materials and techniques did the research use? C: What statistics did the research analyze? D: What procedures did the research follow?
- An<br/>F test for an analysis of variance (ANOVA) tells us () A: which<br/>of the pairs of treatment groups have means that are significantly<br/>different. B: whether<br/>the variances across the treatment groups are significantly<br/>different. C: whether<br/>there is evidence that at least two of the means across treatment<br/>groups are significantly different. D: whether<br/>the experiment was randomized.
- Intelligent control is a class of control techniques that use various AI computing approaches.
内容
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__________ help(s) you determine exactly how the experiment is designed and conducted. A: Methods B: Discussion C: Abstracts D: Results
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__________ help(s) you determine exactly how the experiment is designed and conducted. A: Discussion B: Abstracts C: Results D: Methods
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It's no use ________ such an experiment . A: to make B: to have made C: making D: to be making
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What goals do most companies use e-commerce to achieve?（ ） A: Improved marketing B: Other options are correct C: Better information for control D: Cost reducing
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Maintenance means to control the timing of equipment maintenance.That is to say, the timing of maintenance is achieved through the use of different maintenance methods.Currently, there are three maintenance methods, which are: A: Periodic maintenance B: On-condition maintenance C: Random maintenance D: Breakdown Maintenance