7:16 PM Mon Nov 29 43% AA mathxl.com C + Content X M Take a Test - Alejandra Pineda 2021FA Elementary Statistical Methods (MATH-1342-71305) Alejandra Pineda & | 11/29/217:16 PM = Quiz: SLO Quiz 8 Question 2 of 2 This quiz: 2 point(s) possible This question: 1 point(s) possible Submit quiz Sleep apnea is a disorder in which you have one or more pauses in breathing or shallow breaths while you sleep. In a cross-sectional study of 320 adults who suffer from sleep apnea, it was found that 160 had gum disease. Note: In the general population, about 17.5% of individuals have gum disease. Complete parts (a) through (c) below. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Click here to view the table of critical t-values. (a) What does it mean for this study to be cross-sectional? O A. The data were obtained over the course of time and the study was an experiment. O B. The data were obtained over the course of time and the study was an observational study. O C. The data were obtained at a specific point in time and the study was an experiment. D. The data were obtained at a specific point in time and the study was an observational study. (b) What is the variable of interest in this study? Is it qualitative or quantitative? Explain. Identify the variable of interest. Choose the correct answer below. O A. Whether a person with sleep apnea has gum disease or not. O B. Whether a person has sleep apnea or not. O C. Whether a person has gum disease or not. O D. The proportion of gum disease present in those with sleep apnea Determine whether the variable in question is qualitative or quantitative. Choose the correct answer below. O A. Quantitative-the variable classifies the individuals in the study. O B. Qualitative-the variable can be numerically measured. O C. Quantitative-the variable can be numerically measured. D. Qualitative-the variable classifies the individuals in the study. Submit qu7:16 PM Mon Nov 29 44% > AA mathxl.com C Content X M Take a Test - Alejandra Pineda 2021FA Elementary Statistical Methods (MATH-1342-71305) Alejandra Pineda & | 11/29/21 7:16 PM =Quiz: SLO Quiz 8 Question 1 of 2 This quiz: 2 point(s) possible This question: 1 point(s) possible Submit quiz In a random sample of 81 audited estate tax returns, it was determined that the mean amount of additional tax owed was $3439 with a standard deviation of $2503. Construct and interpret a 90% confidence interval for the mean additional amount of tax owed for estate tax returns. Find and interpret a 90% confidence interval for the mean additional amount of tax owed for estate tax returns. Select the correct choice below and fill in the answer boxes to complete your choice. Use ascending order. Round to the nearest dollar as needed.) A. 90% of taxes owed for estate tax returns are between $ and $. B. One can be 90% confident that the mean additional tax owed is between $ and $. O C. There is a 90% probability that the mean additional tax owed is between $ and $ Next