6). If a researcher declares a difference significance because the value of a is as extreme as 1.65, he is using a two-tailed test" Is this statement true or false? 7) if a researcher would be interested in a significant difference in either direction, should a one-tailed test be used?Please help ASAP. Show working. Thanks.W/s 42

Worksheet 42 One-Tailed Versus Two-Tailed Tests Riddle: Early to bed and early to rise does what? DIRECTIONS: To find the answer to the riddle, write the answer to each question in the space immediately below it. In the solution section, the word in parentheses next to the answer to the first question is the first word in the answer to the riddle, the word beside the answer to the second question is the second word, and so on. 1. In a normal curve, what percentage of the area is above a z-score of 1.96? 2. If we are interested in whether a sample mean is either significantly higher or sig- nificantly lower than the population mean, should we use a one-tailed or a two- tailed test? 3. If we were only interested in whether a sample mean is significantly higher than the population mean, should we use a one-tailed or a two-tailed test? 4. In a normal curve, what percentage of the area is above a z-score of 1.65? 5. "If an investigator obtained a difference in the direction indicated by her research hypothesis, she would likely be more able to declare the difference significant if she used a one-tailed test than if she used a two-tailed test." Is this statement true or false