Statistics Final Exam Verified A+

Statistics Final Exam Verified A+ Statistics describes a set of _________ that are used for describing, organizing and interpreting information. - tools and techniques inferential statistics is the most often used for which of the following? - Interpreting data If you used the Excel formula =SUM(A2:A4), what would be calculated? - The sum of cells A2-A4 Descriptive Statisttics Inferential Statistics - Descriptive statistics describes characteristics of a sample Inferential statistics attempts to infer characteristics of a population for a sample Sample - A sample is a random and representative group of population. In a sample, everyone from a population should have an equal chance of being selected. This measure of central tendency can be considered the least precise - Mode What should be used to determine central tendency - The mean If a distribution is "significantly distorted" what is this called? - Skew What is the mean value of the following scores 12,25,15,27,32,8? - 19.83 Which measure of central tendency is most influenced by outliers? - Mean Your current exam mean is 93.2. If you receive an 87 on the next exam, this will have the effect of - decreasing your mean What are greek letters used to represent? - Population parameters Which of the following defines the median? - midpoint in a set of scores What is the median of the following set of scores: 23,17,15,32,38,47 - 27.5 What is the 75th percentile also known as - Q3 Which of the following are used define the percentage of cases equal to and below a certain point in a distribution of scores? - Percentile points what would be your preferred measure of central tendency if you had the following data: 32,400 42,500 49,570 145,850 - Median What is the mode of the following data: Republicans 47, Democrats 49, and independents 52 - Independants The describing a set of nominal data, a researcher should use which of the following measures of central tendency? - Mode In order to calculate the variance, which of the following must you know? - Mean Which measure of variability is most general and, hence, least useful? - Range What is the most common measure of variability? - Standard Deviation Variability is the measure of how much individual scores differ from the _____ - Mean Which of the following is one way to represent the standard deviation? - s What is the variance for the following set of sample values: 10,15,12,18,19,16,12 - 11.29 As your sample size grows larger, your standard deviation will be - A more accurate estimate of the population What is the most basic method of illustrating data? - Frequency distribution A good rule of thumb when creating an illustration is - to make sure your graph communicates only one idea A distribution of scores in which almost the entire class scored very high but a few students scored fairly low would be _____ - negatively skewed what type of chart or graph displays class intervals along the x axis? - histogram What is the frequency distribution that shows frequencies for class intervals along with cumulative frequency for each? - cumulative frequency distribution if you wanted to look at the flatness or peak in distribution, you would need to look at - Kurtosis If you were interested in tracking your GPA during the time you are in graduate school, which of the following might you use? - Line Graph Which of the following refers to a correlation between two variables - Bivariate If variables change in the same direction, what type of correlation is this called? - Postive correlation