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Question 6 Human measurements provide a rich area of application for statistical methods. In a longitudinal study the development of elementary school children explored the relationship between IQ and private speech. Private speech is considered to be when children talk to themselves. It was thought that private speech would be related to IQ, because IQ is supposed to measure mental maturity, and it was known that private speech decreases as students progress through the primary grades. The study included 34 students whose first-grade IQ scores are given below. Use the following R code to calculate the sample summary statistics, histogram and boxplot. IQ.data = c(81,93,99,102, 103, 103, 106, 107, 107, 107, 108, 108, 109,109,111,111,113,113, 113, 11 4,115,115,118,118,123,123, 124, 125, 127, 132, 136,140,140,146) summary (10.data) sd (IQ.data) hist (IQ.data) boxplot (IQ.data, horizontal = TRUE) Question 6a. Fulls

Using the data above and the summary statistics calculating using R, enter the following values. Round all answers to one place. Mean= 114.9 You are incorrect Median = 115.0 Q1 = You are incorrect Standard Deviation= Minimum = 85.0 12.9 107.0 You are incorrect You are incorrect X X X X

Q3 = You are correct 121.0 You are incorrect Maximum = 141.0 You are incorrect Answered-Incorrect 2 attempts left Question 6b. Homework Unanswered X X Resubmit Based on the histogram and boxplot from R, choose the following statements that correctly describe the IQ scores. Hint: Five are correct statements. (Select all that apply.)

Based on the histogram and boxplot from R, choose the following statements that correctly describe the IQ scores. Hint: Five are correct statements. (Select all that apply.) Multiple answers: Multiple answers are accepted for this question Select one or more answers and submit. For keyboard navigation... SHOW MORE a The boxplot indicates no outliers. b C d e f g h The lowest IQ (81) stands out as a low outlier. The distribution of IQ scores is nearly symmetric. The typical IQ score is around 113. The boxplot indicates 4 outliers. The distribution of IQ scores is very positively skewed. The distribution of IQ scores has an interquartile range from 107 to 123. The distribution of IQ scores has an interquartile range from 81 to 146. D

C d e f g h The distribution of IQ scores is nearly symmetric. The typical IQ score is around 113. The boxplot indicates 4 outliers. The distribution of IQ scores is very positively skewed. The distribution of IQ scores has an interquartile range from 107 to 123. The distribution of IQ scores has an interquartile range from 81 to 146. i The second lowest IQ (93) stands out as an outlier. jThe second lowest IQ (93) is the smallest value that isn't an outlier. Submit