Please answer all questions

5 0f 20 With respect to effect size, what is the issue with reporting only signicance levels of hypothesis tests? Q There could be a decision error. Q The outcome could be due to chance. Q It may be misleading if the effect is too small to be of any practical significance. 6 0f20 Why do we use the tdistribution instead of the normal distribution as our reference distribution? 0 The population variances are unknown and we are estimating them from a sample. 0 You never use the normal distribution in applied statistics. 0 Because our sample size is large. ' Q Since we are using the standard deviation instead of the variances in our calculations. 7 of 20 ' What is the standard error? 0 The standard deviation of the sampling distribution of the mean differences. Q The typical error in a sample estimate. Q The standard deviation of the samples. The square root of the standard deviation. 8 0f20 When testing for differences between the means of two related populations, what is the null hypothesis? The difference between the population means is equal to 0. The difference between the population means is equal to 1. The difference between the population means is greater than 1. @ The difference between the population means is greater than 0. 9 0f20 AType I error occurs when we @ correctly fail to reject a false null hypothesis. correctly reject a false null hypothesis. incorrectly reject a false null hypothesis. t . @ incorrectly reject a true null hypothesis. (r