Statistics Final Exam QUESTIONS ANSWERED AND GRADED

Statistics - CORRECT ANSWER All of the above. Data or functions of data. Techniques for the collection, analysis, and interpretation of data. The science of creating and applying techniques for data collection & analysis Population - CORRECT ANSWER The collection of all objects for observations having one or more specified characteristics A proper subset of a population - CORRECT ANSWER Sample Statistical tools for summarizing data so they can be more readily comprehended are called - CORRECT ANSWER Descriptive statistics The mean, median, and mode are all measures of - CORRECT ANSWER Central tendency The measures of central tendency in order of increasing sampling stability are - CORRECT ANSWER Mode, median, mean The measures of central tendency most affected by extreme scores is - CORRECT ANSWER Mean The most widely used measure of dispersion - CORRECT ANSWER Represents points around which a distribution tends to center The square root of the sum of squared deviations from the mean divided by the number of - CORRECT ANSWER Standard deviation A distribution with mean equal to 90, median equal 101, and mode equal to 103 is - CORRECT ANSWER Positively skewed If a constant "A" is added to each score in a distribution, the standard deviation of the altered distribution (or the new distribution) would be: - CORRECT ANSWER Unchanged The joint frequency of two variables can be represented by a - CORRECT ANSWER Bivariate frequency distribution The line that best describes the linear relationship between two variables is called - CORRECT ANSWER Regression line The value of correlation coefficient, r, range from - CORRECT ANSWER -1 to +1 For a normal distribution, what percentage of the data falls within one standard deviation about the mean - CORRECT ANSWER 68.27% of the scores Probability is defined as - CORRECT ANSWER All of the above A measure of the strength of one's expectation that an event will occur. The ratio of the number of events of interest to the total number of events. The number of events favoring the event of interest divided by the total number of equally likely events. Which of the following is NOT a property of probability? - CORRECT ANSWER The probability assigned to an event is a number between -1 and +1 Which of the following best describes a random variable? - CORRECT ANSWER A numerical quantity defined by the outcome of a random experiment A random variable whose range can assume a countable infinite number of values is said be - CORRECT ANSWER Discrete A random variable is continuous if its range is - CORRECT ANSWER Uncountably infinite The sum over i =1, 2, 3,... n of the product of P (Xi) and Xi, where Xi is a random variable is called - CORRECT ANSWER Expected value of the random variable