- v25. 1.: ':-._-'_:;_._r,-__ The estimated standard deviation of the distribution of differences is used to predict the: a. standard error of the mean c. standard error of the estimate . standard error of the difference d. actual standard score 40. The estimated standard error of difference may be obtained on the basis of the informatton contained in: a. a Single sample 0. the sampling error b. a pair of random samples d. a single 2 score 41. When pairs of samples are selected from two separate populations, the mean of the distribution of differences is assumed to be: a. some value other than zero e. a constant b. zero (1. equal to the means of the distribution means 42. The independent 1; test may be used to evaluate the difference between: a. two sample means 0. the mean and the standard deviation b. two or more sample means (1. the mean and the variance 43. For the independent t test, the null hypothesis states that the samples: a. represent a single population e. are of innite size b. two samples represent differentpopnlations d. each have means scores of zero 44. For the independent t test, degrees of eedom are based on: a. the population sizes c. the number of samples being compared b. the sample sizes (1. none of theSe 45. For the independent t test, the hypothesis of "'no difference\" is called the: a. altemative- hypothesis 6. Central Limit theorem b. null hypothesis d._ hypothesis of association 46. When a difference is considered \"signicant", it indicates that the difference is probably: a. meaningful and profound c. not due to chance alone b. due to chance and chance alone (:1. none of these 47. The difference between the T score and the .t ratio is that: a. the T score always results in a higher value than does the t ratio b. the T score refers to several sample means, whereas the trade only refers to two sample means c. the T score is used as a measure of individual performanCe, whereas the t ratio evaluates the possibility of a performance difference between the Mo groups d. none of these, since-T and t are the same 48. The statement that the difference bemoan the two population means is zero, represents: a. the alpha error , .c. the altemat'tvehyp'othesis b. the sampling error d. the null Medians 49. The alpha error is. identical to the: a. Type 1 error b. Type 2 error C. Type 3 error (L none of. these