Answered: 4. A set of 12 pairs of scores (X and Y…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Question

100%

Help please with these questions

Transcribed Image Text:Chapter 14 Homework Assignment 1. For the following data: Y 9 5 a. Calculate SP using the computational formula. b. Sketch a scatter plot and estimate the Pearson correlation. c. Compute the Pearson correlation. Chapter 15 Homework Assignment* 1. "The student population at the state college consists of 80% of students identifying as female and 20% of students identifying as male. a. Complete problem 2a in chapter 15 Problems (page 506 in 9th edition**). b. Complete problem 2b in chapter 15 Problems (page 506 in 9th edition**). 2. A high school English teacher would like to determine if student's grades are improving over time at her school. She knows that the overall grade distribution for the English department at her school in 1990 had 16 % As, 30% Bs, 25 % Cs, 15% Ds, and 14% Fs. A sample of n-300 English students from the previous semester produced the following grade distribution A 64 B 72 C 66 D E 53 45 Do the data indicate a significant change in the grade distribution? Test at the .05 level of significance. 3. An ice cream company has created three winter flavors of ice cream (snow globe, polar bear tracks, and fireside) but they can only debut one this winter season. To choose the flavor, the company decides to see if there is a significant preference for one. They get a focus group of 120 people to try the three flavors and select the one they prefer. The distribution of preference is as follows: Snow Globe Polar Bear Fede Tracks Fireside 36 16 60 24 a. Do the results indicate any significant preferences among the three flavors? Test at the 05 level of significance. b. Compute Cohen's w to measure the size of the effect. (Remember to write the size of the effect next to the value.) 4. Complete problem 18 in chapter 15 Problems (see page 509 in 9 edition**) but use the following frequency distribution of personalities for participants and the avatars they created. Remember to respond to parts a and b. Introverted 20 23 Extroverted 36 Introverted Avatar Extroverted Avatar 56 44 21 43 57 "Adapted from Chapter 15 Problems from Essentials of Statistics for the Behavioral Sciences (ed.) by Gravetter, Wallnau, and Forzano 5. Complete problem 20 in chapter 15 Problems (see page 509 in 9 edition**) but use the following distribution of student willingness to use mental health services using a binary 2. For a two-tailed test with a 05, use Table 8.6 to determine how large a Pearson correlation is necessary to be statistically significant for each of the following samples. a. A sample of n-3 b. A sample of n=9 c. A sample of n-12 3. Sketch a graph showing the line for the equation Y=3X+5. On the same graph, show the line for YX+8 4. A set of n 12 pairs of scores (X and Y values) produces a regression equation of Y-3X-4. Find the predicted Yvalue for each of the following X scores: -1, 0, 2, 3, 5. 5. For the following data: a. Find the regression equation for predicting from X. b. Calculate the Pearson correlation for these data. User and SS, to compute Sresidual and the standard error of estimate for the equation. Gravetter, WallProblems from Essentials of Statistics for the Behavioral Sciences by *Adapted from Chapter (9 and Forzano 18. A recent study indicates that people tend to select vid- eo game avatars with characteristics similar to those of their creators (Bélisle & Onur, 2010). Participants who had created avatars for a virtual community game completed a questionnaire about their personalities. An independent group of viewers examined the ava- tars and recorded their impressions of the avatars. One personality characteristic considered was introverted/ extroverted. The following table shows frequency distribution of personalities for participants and the avatars they created. Participant Personality Introverted Introverted 22 45 Avatar 16 39 55 Extroverted Avatar 38 62 a. Is there a significant relationship between the per- sonalities of the participants and the personalities of their avatars? Test with a = .05. b. Compute the phi-coefficient to measure the size of the effect. "Adapted from Chapter 15 Problems from Essentials of Statistics for the Behavioral Sciences (9 ed.) by Gravetter, Wallnau, and Forzano. 5. Complete problem 20 in chapter 15 Problems (see page 509 in 9th edition**) but use the following distribution of student willingness to use mental health services using a binary gender variable. Remember to respond to parts a and b Maybe Probably Yes Probably No 10 35 90 Students Identifying as Female Students Identifying a Male 14 18 28 60 24 53 73 N=150 **Page numbers may differ depending on edition/type of textbook "Adapted from Chapter 15 Problems from Essentials of Statistics for the Behavioral Sciences (9 ed.) by Gravetter, Wallnau, and forzano 50 100 50 20. Research has demonstrated strong gender differences in teenagers' approaches to dealing with mental health issues (Chandra & Minkovitz, 2006). In a typical study, eighth-grade students are asked to report their willingness to use mental health services in the event they were experiencing emotional or other mental health problems. Typical data for a sample of n = 150 students are shown in the following table. Willingness to Use Mental Health Services Probably Probably No Maybe Yes Males 17 32 11 60 Females 13 43 34 90 30 75 45 n = 150 a. Do the data show a significant relationship between gender and willingness to seek mental health as- sistance? Test with a = .05. b. Compute Cramér's V to measure the size of the treatment effect. Extroverted 23

Expert Solution