Math 227 Final Exam.review pounds. The sample The average weight of GO randomly
ID: 2947670 • Letter: M
Question
Math 227 Final Exam.review pounds. The sample The average weight of GO randomly selected compact autormobiles was 265o sfandard deviation was 400) pounds. Find the point estimate, the error, and th interval of the population mean. 2. A study was conducted to scc if there was a difference between spouses and significant others in skills were coping skills when living with or caring for a person with multiple sclerosis. These asured by questionnarire responses. The results of the two groups are given on one factor ambivalence. Ata 0.05, is there a difference in the means of the two groups? , Spouses Significant others n, 150 n, 50 3. The relationship betwecn a father's age and the number of children he has is studicd. The data are shown here Father's a 19 21 27 20 25 31 32 35 number of children 1 2 310 1 43 4 a/ Draw a scalter plot b/ Compute the value of the correlation coefficient c/ Test the significance of the correlation coefficient at a d/ Predict the number of children a father whose age is 35. 0.05 4. In a recent study of 75 people, 41 said they were dissatisfied with their community's snow removal service. Find the 95% confidence interval of the true proportion ofindividuals who are disssatisfied with their community's snow removal service. fa farm in Indiana County, Pennsylvania, is 191 acres. The average size of a farm in Greene County, Pennsylvania, is 199 acres. Assume the data were obtained from two samples with standard deviation of Can it be concluded at a Assume the populations are normally distributed, 38 and 12 acres, respectively, and sample sizes of 8 and 10, respectively. 0.01 that the average size of the farms in the two counties is different?Explanation / Answer
1) Point estimate = 2680
Error = 2.58*400/SQRT(60) =133.23
99% Confidence = 2680-133.23 =2546.777
Upper limit = 2680+133.23 =2813.23