
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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For the following titled report, indicate whether the research study involved was exploratory, descriptive, causal or predictive, and explain your reasoning.
“The Effects of Secondary Smoking on Lung Cancer Cases”
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- Read through this scenario and look at the data that was collected. State the null and all possible research hypotheses. Review the results below (I used SPSS) and answer the questions that follow. Scenario: A researcher wants to see if gender and / or income affects the total amount of help given to a stranger who is sitting on the side of a busy road with a sign asking for help. The independent variables are gender, income, and the interaction of gender and income. The dependent variable is total help. He wants to know if one or both factors – or the interaction of the two - affects the total amount of help offered. Because he is analyzing two independent variables (gender and income), he used a factorial ANOVA. His results show the main effect of each of the independent variables on the dependent variable (total help) and the interaction effect. The researcher is using a 95% confidence interval which means that he wants to be at least 95% sure that his independent variables…arrow_forwardYou are now ready to perform your own statistical analyses for each of the following situations. Use the examples given above to produce the SPSS output. Copy the output into a Word document to save paper. Then, type a sentence or two in which you interpret the results using APA reporting method that was outlined above. Use the five step process to help you determine your results and report your findings. In reality, SPSS is doing the calculation for you—your reporting is what would be reported in step 5 of hypothesis testing. Does the average number of years of education attained (EDUC) for this sample differ from the national average of 13.2? (13.2 is the test value.) One-Sample Statistics N Mean Std. Deviation Std. Error Mean Highest year of school completed 2345 13.73 2.974 .061 One-Sample Test Test Value = 0 t df Sig. (2-tailed) Mean Difference 95% Confidence Interval of the Difference Lower Upper…arrow_forwardTwo Different Depression Scales Example 1.28 introduces a study examining the impact of diet on depression. The study used two different ways to measure depression. One is the DASS (Depression, Anxiety, and Stress Scale) which uses self-reported symptoms, while the other is the CESD (Centre for Epidemiological Studies Depression Scale), which is a more involved clinical assessment. On both scales, higher numbers indicate greater depression symptoms.We are interested in whether we can use the self-reported data as a good predictor of clinical results (and hence a good starting point for patients). Figure below shows a scatterplot of the two depression scores for each of the 75 participants at the start of the diet/depression experiment (before the effect of any dietary intervention.) 70 60 50 40 30 20 10 10 20. 30 40 50 60 Self-reported (a) Does the association appear to be positive or negative? (b) Describe, in the context of this situation, the characteristics of a case in each of the…arrow_forward
- Match each term below with the best description by writing the letter for the best description in the blank. Note there is one extra description that won’t be used. Column A Column A 1. subject : subject 2. response variable : response variable 3. control group : control group 4. treatment : treatment 5. lurking variable : lurking variable Column B Column B a. the class that got the test on white paper b. a student in one of the classes c. none in this experiment d. one class may do better than the other class even if both classes get the same color of paper e. color of the paper f. whether or not a student passed the testarrow_forwardFor the description below, what would be of most concern to the researcher? A researcher uses a convenience sample from a small, private high school, but plans to generalize the conclusions of his study to all high schools in the state.arrow_forwardWhat are some issues to consider if you are planning to use statistical analysis in your research? Select all that apply. Question 7 options: Collecting some statistics may require training on particular software or may even require expertise. You might need to acquire the data from another department in your agency or school, such as IT, and that can be time consuming. Software and expertise can be costly. How strong are your math skills?arrow_forward
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- . Do patients with gastrointestinal issues experience more psychological distress than the general population? The DASS-21 questionnaire is a validated measure of depression, anxiety, and stress. For the general population, the mean for anxiety is µ = 4.2. Anxiety levels are calculated based on self-reported answers to questions on a scale from 0 through 42, with lower scores indicating lower anxiety. Participants with gastrointestinal issues (specifically inflammatory bowel disease, IBD) completed the DASS-21. Use the data presented below to determine whether having gastrointestinal issues like IBD significantly increases risk for anxiety. Test whether or not the performance of this sample is significantly higher than the normal population using the proper t-test. Here are the data: Anxiety scores: 12, 15, 10, 8, 10, 5, 10, 13, 4, 6 ANALYSES AND UNGRADED OPTIONAL GUIDING QUESTIONS: 1a. Identify the Indep.Variable:__ Dep.Variable:__ Is it the Hypothesis…arrow_forwardWhich of the following designs refers to a study in which the units of analysis are populations or groups of people rather than individuals (select one best answer)? Ecological study Case-control Study Cohort study Cross-sectional study None of the abovearrow_forwardA major software company is considering a price increase on its most popular product. They are currently selling below their competitor’s price. Someone from the Brand team suggested they check consumer response before making a price increase. You are called into explain how this marketing research might be carried out. In terms of qualitative and quantitative options you tell them...arrow_forward
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