It is examined for 40 people how many hours of driving lessons they had before they passed. According to the CBR, the distribution is n (50.5), but the driving examiners think this is higher. With an a of 0.05, H0: mu = 80 and Ha: mu = 90, what is the effect size (Cohen's d)?A. -3B. -2C. 1D. 2 We perform a one sample t-test on 30 clients with psychological problems. We look for at least an eight point difference between the general population and this group. It is known that mu0 = 120, sigma = 23, mu1 = 130 and a = 0.05 (two-sided). What is the chance that the null hypothesis will be wrongly not rejected?A. 0,35B. 0,41C. 0,45D. 0,52 We want a power of .80 with a = .05. How many participants must then participate in the study with mu0 = 52, mu1 = 48 and sigma = 4.5?A.B.C.D. What is d in a study with mu0 = 10, mu1 = 8, and sigma = 0.5 with two research groups of 20 participants?A. 11,23B. 12,65C. 13,78D.14,25 Which of the variables does not influence the power?A. The alpha levelB. The alternative hypothesisC. The sample sizeD. The effect size The scores of a certain variable are normally distributed in the population with a standard deviation of 12. Suppose that the right-hand side testing is done with the null hypothesis that the population mean is equal to 80. The null hypothesis is known to be rejected from a sample mean of 82.5. What would the power be if the population average was 86? A certain matched pairs t-test yields a significant result at a significance level of 5%. The power of this test with a reasonable effect size of 0.12. What is the probability of incorrectly rejecting the null hypothesis? B. d = (80-90)/5 = -2 A. d = (130...