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The t distribution has "thicker tails" than the normal distribution because gift scores vary because of changes from sample to sample In both the mean and the standard error biz scores vary because of changes from sample to sample In both the mean and the standard error of the t-ratio is the effect sbe divided by the standard error g d someone squashed It 0 9 none of the above Question 2 1 pts A matched t-test is more sensitive than a two independent samples t-test o # Because It has more degrees of freedom @ bj When the matching variable explains a sufficient amount of the within groups variability to offset the decreased degrees of freedom @ c) It is not more sensitive, It just applies to a different type of situation In which a two Independent sample test would not be possible o dj When the matching variable is not correlated with scores Question 3 1 pts What is the reason for using [n-1) in calculating the sample standard deviation (s) instead of just n? * In-1) removes any potential outliers In the simple which could exaggerate the variance o bi (n-1] will yield a larger value of s that is a better approximation of the standard deviation of the population, sigma O c) In-1) yields a smaller value of s, which Is a better reflection of the standard deviation of the population o dj Both a and b Question 4 1 pts Assume that a 95% confidence interval for some population mean ranges from 14 to 22. Based on this information, ... o # the sample mean k X_bar = 14 bi the sample mean Is X_bar = 22 to the sample mean k X_bar = 18 @ dj the simple mean cannot be determined without more Information Question 5 1 pts If you are told that the alternative hypothesis in an experiment is Wy > uy which of the following would be the null hypothesis for the experiment? obj ul = pz 0 4 ul suz 0 dj wis p2 O e) None of the above