A group of disabled women ages 65 and older were followed for several years. It was found that those who had a vitamin B12 deficiency were twice as likely to suffer from severe depressions than those who did not. a. Describe the type of study being performed. b. Describe the explanatory variable(s) and response variable(s).

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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…

A study was done to assess the effectiveness of Acceptance and Commitment Therapy for people with generalized anxiety disorder. The reserachers wanted to know if the treatment decreased or increased the reported levels of anxiety. Six participants were measured before therapy, and after therapy. The dependent variable was the number of reported symptoms. They collected the following data:   Patient                             Pre                      Post                    1                                        21                        15                          2                                        24                        15         3                                        21                        17                        4                                        26                        20                     5                                       32                        17     Which statistical test should be used to measure this? Explain why you selected this test?

A psychologist at a private mental health facility was asked to determine whether there was a clear difference in the length of stay for patients with different categories of diagnosis. Looking at the last seven patients in each of the three major categories, the results (in terms of weeks of stay) were as follows. Using the data below, test whether the length of stay for patients vary based on category of diagnosis.  Diagnosis Category  Affective Disorders  Cognitive Disorders  Drug-related Conditions  7 12 8 6 8 10 5 9 12 6 11 10 9 11 9 5 10 11 6 9 12 The above scenario requires a one-way Anova, with a bar graph. Question - I need to write an explanation for the output given. I am to include a statistical notation and explanation as to whether the results are significant or not significant.  Examples of Explanation: Non-significant:A One-Way ANOVA was conducted to examine whether a preceding situation (watching a…

A researcher would like to know if stress has a negative effect on memory performance. One group of participants was exposed to a stress inducing noise and the second group listened to a calming music. Afterwards, both groups were given a memory test. The researcher compared the average memory test scores of two groups. What is the dependent variable in this experiment? Stress inducing noise. O Stress reducing calming music. O Level of stress (i.e., stress inducing noise or calming music) Memory test performance.

The director of student services at Oxnard College is interested in whether women are less likely to attend orientation than men before they begin their coursework. A random sample of freshmen at Oxnard College were asked what their gender is and whether they attended orientation. The results of the survey are shown below: Data for Gender vs. Orientation Attendance Women Men 431 187 Yes 442 No 214 What can be concluded at the ax = 0.10 level of significance? For this study, we should use Select an answer a. The null and alternative hypotheses would be: Ho: Select an answer Select an answer Select an answer (please enter a decimal and note that p1 and μl represent the proportion and mean for women and p2 and 2 represent the proportion and mean for men.) H₁: Select an answer Select an answer Select an answer (Please enter a decimal) (please show your answer to 3 decimal places.) b. The test statistic c. The p-value = d. The p-value is ? a e. Based on this, we should Select an answer the…

The authors of a paper describe an experiment to evaluate the effect of using a cell phone on reaction time. Subjects were asked to perform a simulated driving task while talking on a cell phone. While performing this task, occasional red and green lights flashed on the computer screen. If a green light flashed, subjects were to continue driving, but if a red light Flashed, subjects were to brake as quickly as possible. The reaction time (in msec) was recorded. The following summary statistics are based on a graph that appeared in the paper. n = 49 x = 530 S = 65 USE SALT (a) Construct a 95% confidence interval for u, the mean time to react to a red light while talking on a cell phone. (Round your answers to three decimal places.) Interpret a 95% confidence interval for μ, the mean time to react to a red light while talking on a cell phone. We are 95% confident that the mean time to react to a red light while talking on a cell phone is between these two values. There is a 95% chance…

Read this same passage and answer this question.  Is it response variable or explanatory variable?

Students at a major university in Southern California are complaining about a serious housing crunch. Many of the university's students, they complain, have to commute too far to school because there is not enough housing near campus. The university officials' response is to perform a study. The study, reported in the school newspaper, contains the following histogram summarizing the commute distances for a sample of 100 students at the university: Relative frequency 0.3+ 0.27 0.23 0.2- 0.19 0.13 0.12 0.1+ 0.06 0- 0. 4 12 Commute distance (in miles) 8 16 20 24 Based on the histogram, find the proportion of commute distances in the sample that are less than 12 miles. Write your answer as a decimal, and do not round your answer.