Psychology assignment 3143
Intro to Statistics 200 Week 2 Homework LANE Text Book 7. . For the data from the 1977 Stat. and Biom. 200 class for eye color, construct: a. pie graph b. horizontal bar graph c. vertical bar graph d. a frequency table with the relative frequency of each eye color a. pie graph b. horizontal bar graph c. vertical bar graph d. a frequency table with the relative frequency of each eye color Eye Color Number of Students Brown 11 Blue 10 Green 4 Gray 1 9. Which of the box plots on the graph has a large positive skew? Which has a large negative skew? (Attachment 1) 6. 6. You recorded the time in seconds it took for 8 participants to solve a puzzle. These times appear below. However, when the data was entered into the statistical program, the score that was supposed to be 22.1 was entered as 21.2. You had calculated the following measures of central tendency: the mean, the median, and the mean trimmed 25%. Which of these measures of central tendency will change when you correct the recording error? Time Seconds 15.2 18.8 19.3 19.7 20.2 21.8 22.1 29.4 8. You know the minimum, the maximum, and the 25th, 50th, and 75th percentiles of a distribution. Which of the following measures of central tendency or variability can you determine? mean, median, mode, trimean, geometric mean, range, interquartile range, variance, standard deviation. Please see website and below numbers in column D0 for questions 30 and 31 30. (AT) What is the mean number of correct responses of the participants after taking the placebo (0 mg/kg)? 31.(AT) What are the standard deviation and the interquartile range of the d0 condition? http://onlinestatbook.com/2/case_studies/adhd.html D0 D15 D30 D60 57 48 64 62 27 42 48 49 32 39 34 30 31 23 25 34 34 36 42 38 38 34 40 36 71 61 59 77 33 36 42 51 34 41 36 45 53 57 67 42 36 32 29 43 42 48 50 57 26 48 44 36 52 39 57 58 36 36 36 35 55 48 57 60 36 35 30 33 42 39 36 49 36 32 41 33 54 48 65 59 34 35 35 35 29 28 40 37 33 27 43 45 33 40 44 29 Illowsky Text Book 78. Twenty five randomly selected students were asked the number of movies they watched the previous week. The results are as follows. # Of Movies Frequency Relative Frequency Cumulative Relative Frequency 0 5 1 9 2 6 3 4 4 1 a. Construct a histogram of the data. b. Complete the columns of the chart. 80. If the data were collected by asking the first 111 people who entered the store, then the type of sampling is: a. cluster b. simple random c. stratified d. convenience 84. Given the following box plot: (Attachment 2) a. which quarter has the smallest spread of data? What is that spread? b. which quarter has the largest spread of data? What is that spread? c. find the interquartile range (IQR). d. are there more data in the interval 5–10 or in the interval 10–13? How do you know this? e. which interval has the fewest data in it? How do you know this? i. 0–2 ii. 2–4 iii. 10–12 iv. 12–13 v. need more information 88. Given the following box plots, answer the questions. (Attachment 3) a. In complete sentences, explain why each statement is false. i. Data 1has more data values above two than Data 2has above two. ii. The data sets cannot have the same mode. iii. ForData 1, there are more data values below four than there are above four. b. For which group, Data 1 or Data 2, is the value of “7” more likely to be an outlier? Explain why in complete sentences.
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