Statistics Chapter 1-4

Statistics Chapter 1-4 Questions and Answers. Define the term Population Correct Answer: the entire collection of individuals or objects about which information is desired. may be considered to be finite or infinite Define the term Census Correct Answer: a collection of data from every member of the population Define the term Population Sample Correct Answer: a sub-collection or subset of a population selected for study Define the term Parameter Correct Answer: a numerical characteristic of a population Define the term Statistic Correct Answer: a numerical characteristic of a sample Define a Variable Correct Answer: the characteristic about which we are interested Define the term Data Correct Answer: the observations that have been collected Give an example of Qualitative Data Correct Answer: categorical or attribute data Give an example of Quantitative Data Correct Answer: numerical data Discrete Data Correct Answer: count data quantitative) Continuous Data Correct Answer: measure data quantitative) What do we mean by Sampling Error? Correct Answer: the difference between the result of a sample and the result for the entire population. caused by random fluctuations of the sample- i.e. by chance. Normal Correct Answer: bell-shaped distribution. Define the term Statistically Significant Correct Answer: the observation that is extremely unlikely to happen simply by chance. State the steps of Descriptive Statistics Correct Answer: the collection, presentation, and description of data. Inferential Statistics Correct Answer: interpreting the data in order to draw conclusions about the population, based on information obtained from a sample. What do we mean by a Frequency Distribution? Correct Answer: a chart or table giving the values of a variable together with their corresponding frequencies. Classify Blood Type as a category of data Correct Answer: example of a frequency distribution for qualitative data. What do we mean by a Class Width? Correct Answer: the difference between two consecutive lower-class boundaries. What do we mean by Class Mid-points? Correct Answer: the center value of each class Define Relative Frequency Correct Answer: a proportional measure of frequency, calculated by dividing the frequency of that class by the total frequency of the data set. Describe a Pie Chart Correct Answer: a circular graph showing the relationships of parts to a whole, only one variable at a time may be displayed.