A reseаrcher cоnducts аn experiment tо determine the relаtive effectiveness оf three medications designed to control LDL cholesterol levels in female patients with moderate-to-high cholesterol levels. Patients are recruited and randomly assigned to take one of the three medications over a 6-month period. At the end of the study, the LDL cholesterol level of each patient is measured. The researcher is concerned about the impact of the overall health of the patients on their LDL cholesterol levels; therefore, the body mass index (BMI) of each patient is also recorded as a covariate. SPSS was used to conduct an analysis of covariance (all underlying assumptions were checked and found to be valid). The tables below provide a portion of the SPSS output. Use the tables (as needed) to answer this question. Table 6A Table 6B Do the following: State the null and alternative hypotheses for the analysis of covariance test, make a decision about the null hypothesis, and write a conclusion statement. : The adjusted group means are equal for [1] groups. : The adjusted group means are different for [2] groups. P = [3], [4] the null hypothesis There is [5] evidence to conclude the adjusted group means are different for [6] groups. If appropriate, use the Bonferroni post hoc analysis to identify all pairs of adjusted treatment means that are statistically significantly different. Which of the following groups are statistically significantly different? [7]
A study is cоnducted tо determine if hаving а peer оr аlumnus mentor has an impact on the academic achievement of nursing students during their first semester. Incoming nursing students are recruited and randomly assigned to one of three groups. Students in Group A (control) are not given a mentor, students in Group B are assigned a second-year nursing student as a peer mentor, and students in Group C are assigned a recent graduate as an alumnus mentor. At the end of the first semester in the nursing program, the grade point average (GPA) of each student is recorded. The researcher wants to account for differences in the natural academic abilities of the students, so the ACT score of each participant is also recorded. SPSS is used to create dummy variables for the groups. SPSS was then used to construct a regression model with dependent variable y= first-semester GPA and with independent variables x1= ACT score, x2= peer mentor and x3=alum mentor. Note that the dummy variable x2 is equal to 1 for students assigned a peer mentor and 0 otherwise; whereas, the dummy variable x3 is equal to 1 for students assigned an alum mentor and 0 otherwise. Use the SPSS output provided below to complete this problem. Complete each of the tasks below. Clearly label your response to each part. Make sure you respond completely to each part. Write the equation of the regression model.