11) Is a Type I or Type II error more likely if a 0.05 level is used? Explain. 12) A “codebook†is A) only used in existing statistics research. B) a document that tells the researcher where variables are located in the data file and what numbers go with what variable attributes. C) the set of instructions that tell interviewers or experimenters how to treat respondents or subjects. D) an unnecessary part of data analysis since computers were invented. E) a sheet of paper with a grid of 80 columns corresponding to data card columns, with rows representing an individual card. 13) A researcher wants to express the middle of a distribution of numbers whereby half the cases are higher and half the cases are lower than the middle value. What statistical measure should the researcher use? A) Mean B) Median C) Mode D) Standard deviation E) Correlation 14) Calculate the median for the following six shoe sizes: 9, 10, 10, 8, 12, 11. A) 8 B) 8.5 C) 9 D) 9.5 E) 10 15) Calculate the mode for the following six shoe sizes: 9, 10, 10, 8, 12, 11. A) 8 B) 8.5 C) 9 D) 9.5 E) 10 16) You discover that the years of marriage before a divorce for nine whites and nine non-whites are as follows: Whites 12, 1, 8, 9, 10, 17, 3, 6, 6 Non-Whites 1, 9, 15, 18, 11, 13, 14, 7, 3 Which statement about this data is TRUE? A) There is no difference in the range for the two groups. B) The median years of marriage prior to divorce is three years longer for whites than non-whites. C) The mean years of marriage prior to divorce are the same for both groups. D) On average, non-whites stay married longer prior to divorce than whites. E) The mode for the two groups is the same. 17) Calculate the mean for the following six shoe sizes: 9, 10, 10, 8, 12, 11. A) 8 B) 8.5 C) 9 D) 9.5 E) 10 18) An elementary school teacher has three classes. She finds the following mean and standard deviations for student IQ scores. Mean Standard Deviation Class #1 106 32 Class #2 104 9 Class #3 110 16 Mean Standard Deviation Class #1 106 32 Class #2 104 9 Class #3 110 16 She knows she is most effective when the students all have similar IQ levels. Which class is she likely to be most effective with? A) Class #1 B) Class #2 C) Class #3 D) Classes #1 and #2 equally E) Classes #1 and #3 equally Refer to the information in the following table when answering questions 8 to 16: 19) Which neighbourhood(s) has an income distribution resembling a skewed curve? A) Glenbrook B) Meadowbrook C) Elmbrook D) Glenbrook and Elmbrook E) Meadowbrook and Elmbrook 20) Which neighbourhood(s) has an income distribution resembling a normal curve? A) Glenbrook B) Meadowbrook C) Elmbrook D) Glenbrook and Elmbrook E) Meadowbrook and Elmbrook