A researcher predicts that scores in treatment A will be lower than scores in treatment B. Which of the following is the correct alternative hypothesis for a one-tailed test evaluating this prediction? a. μA < μB b. μA > μB c. μA < μB d.μA > μB

has a different lifespan in water at a 0.05 level of significance. Sunscreen A Sunscreen B Sunscreen C Sunscreen D 43 66 64 49 90 80 51 74 40 57 44 83 87 74 63 43 43 31 49 84 58 57 64 68 The hypotheses for this ANOVA test would be: Ho: HA = HB = µc = HD HA: At least one mean is different. (claim) a = 0.05 Complete the ANOVA table below: (round answers to 3 decimal places) df MS F p-value Between Within The decision of the test is to: reject Ho odo not reject Họ The final conclusion is:

A researcher expects a treatment to produce an increase in the population mean. Assuming a normal distribution, what is the critical z-score for a one tailed test with a = .01? a. +2.33 b. ±2.89 c.+1.33 d. ±2.33

One group of accounting students took a distance learning class, while another group took the same course in a traditional classroom. At α = .10, is there a significant difference in the mean scores listed below?  Exam Scores for Accounting Students Statistic Distance Classroom Mean scores x⎯⎯1x¯1 = 9.0 x⎯⎯2x¯2 = 10.2 Sample std. dev. s1 = 2.1 s2 = 2.4 Number of students n1 = 19 n2 = 19   Assume μ1 is the mean score of distance learning and μ2 is the mean score of classroom learning. The appropriate hypotheses is H0: μ1 – μ2 = 0 vs. H1: μ1 – μ2 ≠ 0 (b) Specify the decision rule. (Round your answers to 3 decimal places. A negative value should be indicated by a minus sign.) Reject the null hypothesis if tcalc < _______. Or tcalc > ______________. (c) Find the test statistic tcalc. (Round your answer to 4 decimal places. A negative value should be indicated by a minus sign.) tcalc      ______________