Statistics Final Exam Solutions for BEC1 WGU - Practice-Ready Answer Guide

Statistics Final Exam Solutions for BEC1 WGU - Practice-Ready Answer Guide Data values that do not fit the pattern of the rest of the data are - answer - are considered outliers A strong correlation (0.85) between the independent variables that you want to include in one multivariate linear regression model is an indication that which assumption has been violated? - answer - multicolinearity Commonly used techniques of presenting and organizing statistical data include which of the following? - answer - descriptive statistics, graphical displays and frequency distributions A psychologist is interested in learning how well his clients are doing with a certain treatment. He asks his clients to complete the following survey. The data collected will be used to create After taking the medication, I feel 0 Depressed after 15 hours 1 Depressed after 10 hours 2 Depressed after 5 hours 3 No change - answer - interval scale The set of probabilities associated with each possible outcome in the sample space is referred to as - answer - probability distribution A null hypothesis was not rejected, and later it was found that the results were false. This is an example of - answer - type II error One of the important benefits of multivariate regression over many other statistical tests is that it - answer - allows you to adjust for potentially confounding variables A research project that follows the participants forward in time to identify future outcomes is referred to as - answer - cohort study 10 9. You are conducting a study and want to look at the correlation between the average number of green vegetables consumed per week and a number of health-related biomarkers (eg, cholesterol, triglycerides, glucose). Based on the histogram for the green vegetable consumption variable, which of the following correlations would be the most appropriate? (Select all that apply.) - answer - ... In a study looking at the correlation between annual income and cholesterol level, one concern was that the age of the participants might be a confounder because both income and cholesterol generally increase with age. Which of the following correlation methods could the researchers use to remove the influence of age on the correlation between income and cholesterol level? - answer - partial correlation Statistics use distinct symbols to represent specific information. Parameters are usually represented by - answer - lowercase Greek letters Researchers conducting a study with ____ power have a _____ probability of committing a type ____ error. - answer - low;high;II The ______ of any statistical test represents the probability that the results were obtained by chance alone. - answer - p-value A multivariate regression model looking at the association of intraocular pressure (mm hg) with (1) having seasonal allergies, (2) wearing contact lenses, and (3) using eye drops found a coefficient of determination (r2) of 0.23. How would you interpret this statistic? - answer - seasonal allergies, contact lens use, and eye drop use taken together explain 23% of the variation in intraocular eye pressure. The local health department is interested in determining if there is a difference in the incidence of childhood caries among children living in rural areas drinking untreated well water and children living in cities drinking fluorinated water. A null hypothesis could read - answer - the oral health of the rural children will not differ from that of the city children. A potential mistake when interpreting the data is to reject the H0 when it is true. This is referred to as - answer - a type I error Compute the mean for men, women, and overall for weight loss using the following information: - answer - Women: 4.5 lbs; Men: 7.25 lbs; Total 5.6 lbs Researchers articulate the expected relationships between the variables by the _______. - answer - null hypothesis The study plan hypotheses - answer - must be very specific The _____ of a test is the probability