HW4_Laura Hembree_510D01

PSYC 510 H OMEWORK : D ATA O RGANIZATION AND D ESCRIPTIVE S TATISTICS A SSIGNMENT I NSTRUCTIONS O VERVIEW This Homework: Data Organization & Descriptive Statistics Assignment is designed to assess your understanding of the concepts and applications covered thus far in this course. In this module, you have looked at how to organize data and describe it in terms of central tendency, dispersion, and shape of distribution. You also have covered cover how to standardize a distribution of data in order to see how a single score compares to other scores. These topics are covered conceptually as well as how to calculate them by hand and in SPSS. These concepts and applications are fundamental to understanding and evaluating data as a consumer in a data-laden world, a consumer of data within our field, and producer of research in our field. I NSTRUCTIONS Be sure you have reviewed this module’s Learn section before completing this Homework: Data Organization & Descriptive Statistics Assignment . This Homework: Data Organization & Descriptive Statistics Assignment is worth 60 points. Each question is worth 3 points each. Six points are awarded for mechanics/structure.  Part I contains general concepts from this module’s Learn section .  Part II requires use of SPSS. You will have to take screen shots and/or copy and paste from your SPSS to place answers within this file. Make sure you only insert relevant and legible images.  Part III is the cumulative section. These may include short answer and/or use of SPSS but will review material from previous module(s).  Directions for each subsection are provided in the top of each table (in the blue shaded areas).  Answers should be placed where indicated (wherever there is “ ANSWER ”).  Submit the file as a WORD document (.doc or .docx). Make sure the filename of your submission includes your full name, course and section. o Example: HW4_JohnDoe_510B01 Make sure to check the Homework Grading Rubric before starting this Homework: Data Organization & Descriptive Statistics Assignment . Part I: General Concepts These questions are based on the concepts covered in this module’s assigned readings and presentations. 3 1 47 53 57 61 67 40 49 55 58 62 68 Page 1 of 6

PSYC 510 41 50 56 58 64 69 1. The following data represents 18 emotional intelligence test scores. Organize these data into a class interval frequency distribution using 3 intervals with frequency ( f ) and relative frequency ( rf ) columns. ANSWER: Fill in the yellow cells: 2. What is the class width ? What is the upper class limit of the first interval? ANSWER The upper class limit interval is 44. Answer the following question related to your assigned readings and presentations. 3. What do the following symbols represent? a. N b. µ a. This symbol represents population size. b. This symbol represents population mean. Use the following five (5) numbers to calculate the following by hand (must show all work and do NOT round 4. Calculate all measures of central tendency. Label each one. Mean= (3+3+4+5+9)/5= 4.8 Median=4 (the middle most) Mode= the highest frequency 5. Is this data best described as normal, positively skewed, or negatively skewed? How does your previous answer confirm this? Positively skewed because mean is greater than the median. 4.8>4= positively skewed. 6. Calculate the range and average deviation. Show all work. Range- 9-3= 6avg deviation= (1/5) * (|-1.8| + |-1.8| + |-0.8| + |0.2| + |4.2|) =1.76 7. Calculate the standard deviation using the formula from ch.5 . Show all work. Page 2 of 6 Class Intervals (use whole numbers) f rf (round to 2 decimals) ANSWER 31-44 3 0.17 ANSWER 44-57 6 0.33 ANSWER 57-69 9 0.5 N = 18

PSYC 510 Part II: SPSS Application These questions require the use of SPSS. Remember you must submit all of your work within this word document. You will need to take a screen shot of your data view if necessary, or copy and paste your output into the spaces below. The following dataset contains scores for depression, a subscale on the DASS-21 from 18 individuals. This variable is considered scale and is discrete. Enter the following data into SPSS to answer the following questions. Make sure you name the variable “Depression” and that you set the scale of measurement within SPSS. 11 13 15 17 18 22 7 8 18 17 13 11 9 16 18 12 13 15 13. Insert the descriptive statistics table (NOT the frequency table) from your SPSS output. 14. Create a histogram of the data using SPSS and paste it below. Page 4 of 6

PSYC 510 Part III: Cumulative These questions can be related to anything covered thus far in the course. As part of his dissertation, Joe wanted to know if an icecream reward can increase the number of books read by children in the first grade. The small school has four 1 st grade classes – two are given the reward and two are not; total number of books read at the end of the term are compared. 15. What is the independent variable? Is it a true manipulated variable or a subject / participant variable? The number of awards granted is the independent variable. It is an altered variable. 16. What is the dependent variable? What is its scale of measurement? The quality of books read at the conclusion of the term is the dependent variable. The scale used would be the ordinal scale. 17. He found a huge difference – students read more in the classes rewarded with A possible complicating factor would be student enrollment. Page 5 of 6