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Misinterpretations of the p-value
A common criticism of null hypothesis testing stems from researchers misinterpreting the -value. A frequent error is believing that the -value represents the probability that the null hypothesis is true, rather than the probability of observing the sample data if the null hypothesis were true. Another closely related misconception is assuming that equals the probability of replicating a statistically significant result, a claim that is overly optimistic and ignores the crucial role of statistical power in replication.
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Research Methods in Psychology - 4th American Edition @ KPU
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Don't make such black and white interpretations
Report effect sizes
Factors Determining the p-value
Test Statistic
Misinterpretations of the p-value
Alpha (Level of Significance)
p-hacking
The 2015 Ban on Null Hypothesis Testing
Alpha Criterion
What does a p value represent in the context of psychological research?
If a psychology researcher calculates a p-value of 0.08, they will typically declare the experimental result to be statistically significant.
A social psychologist is analyzing data from four different studies. Based on the standard thresholds for statistical significance provided in the table, match each study's obtained p value with its correct interpretation.
A psychologist is comparing findings across four different research studies. Based on the definition of a p value and the significance thresholds provided in the table, arrange these findings in order from the outcome LEAST likely to have occurred by chance to the outcome MOST likely to have occurred by chance.
According to the standard threshold of significance () in psychology, a research result is typically declared significant if the probability of it occurring purely by chance is less than in how many?
Misinterpretation of the p Value
Determinants of the Value
Based on the significance thresholds provided in the table and the definition of a value, match each statistical label with the correct description of its probability occurring purely by chance.
A researcher obtains a value of and labels the result 'highly significant' (). According to standard significance thresholds, where and , this labeling is _____.
A cognitive psychologist conducts an experiment on learning styles and calculates a value of . Applying the standard threshold of significance () described in the text, the researcher should declare this result to be statistically significant.
According to the standard threshold of significance (), a psychological research result is typically declared significant if the probability of the outcome occurring purely by chance is less than 1 in _____.
Evaluate the following three experimental results and arrange them in order from the outcome representing the lowest probability of occurring purely by chance (1) to the outcome representing the highest probability of occurring purely by chance (3).
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What is a frequent error researchers make when interpreting a p-value?
If a study yields a statistically significant result with a p-value of .04, it means there is a 96% probability that a replication of the study will also achieve a statistically significant result.
A psychologist conducts a study on a new mnemonic technique and obtains a result of p = 0.03. Match each statement about this result to the specific interpretation category it represents.
A researcher obtains a -value of .04 and concludes that there is a 96% probability that a replication of the study will also yield a statistically significant result. This interpretation is an error because the -value does not account for __________, which is a crucial factor that determines the actual likelihood of reproducing a finding.
A researcher obtains a result of and claims there is a probability that a replication of the study will also yield a statistically significant result. Arrange the following steps in the logical process of evaluating the validity of this researcher's claim, from the initial analysis of their reasoning to the final judgment of the interpretation.
You are designing a standardized reporting protocol for a psychology lab to ensure that researchers do not misinterpret their findings. For a study that yields a result of , which of the following reporting structures should you construct to correctly define the significance level while explicitly guarding against the common misconceptions regarding the probability of the null hypothesis and the likelihood of replication?
In a psychological experiment, the -value represents the probability that the null hypothesis is true.
A researcher publishes a study on a new teaching method and reports a result of . Match each statement about this result to its correct description.
A psychology student critiques a research paper where the authors claim that a -value of .05 means there is a 95% chance of replicating the study's significant findings. The student correctly notes that this claim is overly optimistic because it ignores the crucial role of statistical _____ in replication.
A peer reviewer is evaluating a manuscript containing the claim: 'Our study yielded , indicating a 4% chance that the null hypothesis is true and a 96% chance that a replication will be successful.' Arrange the steps in the logical order the reviewer should follow to evaluate and correct this claim.