A developmental psychologist is studying the correlation between infant screen time and vocabulary size. To be as confident as possible that their rejection of the null hypothesis is correct (i.e. minimizing the probability that the observed correlation is due to random chance), they seek the most stringent significance level.
Which of the following options identifies the ppp-value that represents the highest level of confidence for rejecting the null hypothesis, along with its correct interpretation?
p<0.01p < 0.01p<0.01, representing a less than 0.1%0.1\%0.1% probability that the results occurred due to random chance.
p<0.001p < 0.001p<0.001, representing a less than 0.1%0.1\%0.1% probability that the results occurred due to random chance.
p<0.05p < 0.05p<0.05, representing a less than 0.5%0.5\%0.5% probability that the results occurred due to random chance.
p<0.10p < 0.10p<0.10, representing a less than 10%10\%10% probability that the results occurred due to random chance.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.