Engineering homework help

Engineering homework help. 1. In a study of brain waves during sleep, a sample of 29 college students wererandomly separated into two groups. The first group had 15 people and were eachgiven ½ liter of red wine before sleeping. The second group had 14 people and weregiven no alcohol before sleeping. All participants when to sleep at 11 PM and theirbrainwave activity was measured from 4-6 AM. The group drinking alcohol had amean brainwave activity of 19.65 hertz and a standard deviation of 1.86 hertz. Thegroup not drinking alcohol had a mean of 6.59 hertz and standard deviation of 1.91hertz. Compute a 90% confidence interval for the difference in population means ofgroups drinking alcohol before sleeping and those not drinking alcohol beforesleeping. Explain the meaning of the confidence interval. 2. A study comparing children’s reading age (in months) was developed using identicaltwin toddlers. One set of 6 twins played for 2 hours each day with educational toys(experimental group), the corresponding set of 6 twins played for 2 hours each daywith non-educational toys (control group). The mean difference in reading agebetween the experimental group and control group of 6 sets of twins was -2.33months and the standard deviation of the sample difference was 2.16 months. Setup a hypothesis test to determine if there is a difference between the 2 groups anduse the appropriate sample test statistic to determine if the difference in reading ageis significant at the 5% level. 3. Discuss the following:a. What type of data can be examined using the Chi-Squared Teb. What is the only constraint in using Chi-Squared Tests?c. What problems can be caused by the way the data have been grouped?

Engineering homework help