A researcher randomly assigns college freshmen to either of two experimental conditions. Because both groups consist of college freshmen, someone claims that it is appropriate to use a t test for the two related samples. Comments?
Answer to relevant QuestionsIndicate whether each of the following studies is an experiment or an observational study. If it is an experiment, identify the independent variable and note any possible confounding variables. (a) A psychologist uses ...Although the samples are actually related, an investigator ignores this fact in the statistical analysis and uses a t test for two independent samples. How will this mistake affect the probability of a type II error? The investigator mentioned in Review Question 14.14 wishes to conduct a more extensive test of the effect of alcohol consumption on the performance of automobile drivers, possibly to gain more information about the legal ...A psychologist employs a two- factor experiment to study the combined effect of sleep deprivation and alcohol consumption on the performance of automobile drivers. Before the driving test, the subjects go without sleep for ...To appreciate the impact of large sample size on the value of x2, multiply each of the observed frequencies in the previous question by 10 to obtain the following: Even though the sample size has increased by a factor of 10, ...
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