# Introduction to the Practice of Statistics Essay

3059 WordsJul 11, 201213 Pages
Section 1.1 - Introduction to the Practice of Statistics 1. Explain the difference between a population and a sample. A population is the entire group to be studied and a sample is a portion of the population. 2. Explain the difference between a parameter and a statistic. A statistic is a numerical summary of a sample and a parameter is a numerical summary of a population. 3. What is Descriptive Statistics and how is it used? Descriptive statistics describes the results of a sample without making conclusions of the population. 4. What is Inferential Statistics and how is it used? Inferential statistics uses the result of a sample to apply to a population. 5. Determine whether the following variables are qualitative or…show more content…
The sample is the 50,000 households that were surveyed. 12. The information in the table below refers to the 2008 model year product line of BMW automobiles. Identify the Individuals, variables, and data corresponding to the variables in the table below. Determine whether each variable is qualitative, continuous, or, discrete. Please refer to problems #51 and #53 on page 13 for examples. BMW Car Model Body Style Weight (lb) Number of Seats 3 Series Coupe 3,350 4 5 Series Sedan 3,500 5 6 Series Convertible 4,275 4 7 Series Sedan 4,490 5 X3 Sport Utility 4,015 5 Z4 Roadster Coupe 3,100 2 a) Individuals: 3 series, 5 series, 6 series, 7 series, X3, Z4 Roadster b) Variable names, data, and types of variables: Variable names: Body Style, Weight, Number of Seats Body Style data: Coupe, Sedan, Convertible, Sedan, Sport Utility, Coupe Weight data: 3,350; 3,500; 4,275; 4,490; 4,015; 3,100 Number of Seats data: 4, 5, 4, 5, 5, 2 Variable Body Style is qualitative, variable Weight is continuous, variable Number of Seats is discrete 13. A study conducted by researchers was designed to "determine if application of duct tape is as effective as cryotherapy in the treatment of common warts." The researchers randomly divided 51 patients into two groups. The 26 patients in Group 1 had their warts treated by applying duct tape to the wart for 6.5 days and then removing the tape for 12 hours, at which point the cycle was repeated for a