Practice Problems: t-tests A research study was conducted to examine the differences between older and younger adults on perceived life satisfaction. A pilot study was conducted to examine this hypothesis. Ten older adults (over the age of 70) and ten younger adults (between 20 and 30) were give a life satisfaction test (known to have high reliability and validity). Scores on the measure range from 0 to 60 with high scores indicative of high life satisfaction; low scores indicative of low life satisfaction. The data are presented below. Compute the appropriate t-test. Older Adults Younger Adults 45 34 38 22 52 15 48 27 25 37 39 41 51 24 46 19 55 26 46 36 Mean = Mean = S S= 1. What is your computed answer? 2. What would be the null hypothesis in this study? 3. What would be the alternate hypothesis? 4. What probability level did you choose and why? 5. What is your terit? 6. Is there a significant difference between the two groups? 7. Interpret your answer. 8. If you have made an error, would it be a Type I or a Type II error? Explain your