b. What inferential test was done to test changes over time of caregiver characteristics (Table A4-2)? Is this test parametric or non-parametric? Does Physical Function change over time at a statistically significant level (compare the p-value to the alpha level)?Inferential statistics allow researchers to generalize findings from sample size to that of an entire population with a certain amount of confidence regarding the research findings. To estimate the stress associated with caregiving Burden Index, a 22-item measure, has been completed by caregivers. Burden index is designed to assess feelings of anger, frustration, and stress as well as the burden of being a caregiver. This is a parametric test because ‘t-tests’ were used to compare variables. The data analysis showed that social function (SF) subscale (SF-36) increased significantly between the first and second years of caregiving and the probability error value (p-value) is given as plt.0.1.c.What inferential test was done to test predictors of Health-Related QOL: MCS and Health-Related QOL: PCS (Table A4-3)? What three predictor variables are in the model for HRQL: MCS at the first interview? Which one has the largest sB? What is the R2 value for the model at the first interview? What does this mean?Health-related quality of life (HRQL) was measured using the medical outcome study, a generic scale 36-item short-form health survey. The mental component summary (MCS) and Physical component summary (PCS) are standardized to have a mean of 50 and a standard deviation of 10. In the study of White et al internal consistency of the subscale ranged between 0.78 and 0.94.The overall quality of living (QoL) was measured using a 0-10 numerical rating scale that has a single-item measure for a global construct. A series of linear regression models, developed for first and second years of caregiving, was used to measure the impact of patientcharacteristics and caregiver characteristics on caregiver HRQL.