Quiz 1 Statistics Questions & Answers

Quiz 1 Statistics Questions & Answers _______ are sample values that lie very far away from the majority of the other sample values. outliers - ANSWER: _______ is used when subjects are assigned to different groups through a process of random selection. Randomization - ANSWER: A _______ helps us understand the nature of the distribution of a data set. frequency distribution - ANSWER: A _______ histogram has the same shape and horizontal scale as a histogram, but the vertical scale is marked with relative frequencies instead of actual frequencies. relative frequency - ANSWER: A _______ is a graph of each data value plotted as a point. dotplot - ANSWER: A _______ is a plot of paired data (x,y) and is helpful in determining whether there is a relationship between the two variables. scatterplot - ANSWER: A data value is considered _______ if its z-score is less than −2 or greater than 2. significantly low or significantly high - ANSWER: A defunct website listed the "average" annual income for Florida as $35,031. What is the role of the term average in statistics? Should another term be used in place of average? The term average is not used in statistics. The term mean should be used for the result obtained by adding all of the sample values and dividing by the total number of sample values. - ANSWER: A frequency table of grades has five classes (A, B, C, D, F) with frequencies of 4, 14, 18, 5, and 1 respectively. Using percentages, what are the relative frequencies of the five classes? 9.52 33.33 42.86 11.90 2.38 - ANSWER: A histogram aids in analyzing the _______ of the data. shape of the distribution - ANSWER: A random sample of 10 subjects have weights with a standard deviation of 9.7891 kg. What is the variance of their weights? Be sure to include the appropriate units with the result.