A university counselor believes that hypnosis is more effective than the standard treatment given to the students who have high test anxiety. To test his belief, he randomly divides 22 students with high test anxiety into two groups. One of the groups receives the hypnosis treatment, and the other group receives the hypnosis treatment, and the other group receives the standard treatment. When the treatments are concluded, each student is given a test anxiety questionnaire. High scores on the questionnaire indicate high anxiety. The following are the results: Hypnosis 20 21 33 40 24 43 48 31 22 44 30 Treatment Standard *PPSPPSPFE 42 35 30 53 57 26 37 30 51 62 59 Treatment Using the Mann-Whitney U Test and a = 0.051 tail, would it be valid for the university counselor to conclude that hypnosis treatment is more effective than the standard treatment given to students with high test anxiety?

A Psychology student wanted to study whether there is a difference in stress levels between gender. She devised a survey to measure stress. There were 20 questions with a total score of 100. She randomly selected 30 male and 30 female students to complete the survey. The stress scores of these 60 students can be found below. Male Female 67 70 68 76 67 69 69 75 70 73 68 88 69 68 70 69 70 75 70 79 71 71 71 68 70 71 71 68 72 78 70 76 69 75 69 69 71 69 69 71 70 68 70 76 70 74 72 71 71 69 70 70 71 74 69 80 72 69 71 79 (i) Describe the 90% confidence intervals for the mean stress score of each gender. Based on the confidence intervals, discuss whether we can conclude that the stress level of both genders are similar. You are required to present the relevant Excel reports. (ii) Apply an appropriate hypothesis test at the 10% significant level to determine whether the stress levels of both genders are similar. You are required…

Dr. Caldwell was also interested in learning whether the anxiety of child victims is related to whether they testify in court. She conducted another research study in which she compared the anxiety levels of 10 children who testified to the anxiety levels of 10 children who did NOT testify. She measured the children’s anxiety using the same test described earlier - the Beck Anxiety Inventory for Children (BAI-C). The scores of the 20 children are as follows: Testified​​Did NOT Testify ​55​54 ​57​62 ​50​72 ​62​69 ​66​73 ​48​58 ​71​75 ​60​63 ​70​70 ​52​66 11. Conduct an independent measures t-test to determine whether Dr. Caldwell can conclude that there is a significant difference between child victims who testify and those who don’t with respect to anxiety. Show all 4 steps of hypothesis testing, and calculate a measure of effect size. Use a 2-tailed test with α = .05 Step 1: Step 2: Step 3: show calculations and values for: M and SS for each group, the pooled…

A criminal psychologist is interested in whether individuals in high power corporate positions are more likely to feel they can escape the law than those in lower management positions. The psychologist randomly sampled 3 different groups. Group 1 consisted of n=12 CEO's of large corporations, Group 2 consisted of n=12 vice presidents of large corporations, and Group 3 consisted of n=12 middle managers. Each participant was asked to fill out a questionnaire measuring their attitudes towards their ability to escape the law on an interval scale from 0 to 15 (higher scores indicate greater sense that they can escape the law). Using the data provided below, do people in different corporate positions have different attitudes towards the law? Test at an alpha = 0.05. SS between= 73.96SS within= 213.14  a) Null & alternate hypothesis  b) Critical Value & Obtained Value  C) Value of Tukeys HSD

A social psychologist wants to know if people judge a person's attractiveness differently if they appear rich or poor. Two pictures were taken with the same model, one in expensive clothes standing next to a new sports car, and the other in old clothes standing next to an old hatchback car.  In an online survey, participants were randomly divided so that they saw one of the two pictures and were asked to rate the model's attractiveness on a scale of 1 to 10.  Which statistical test would be best to determine if there is a significant difference between groups?     one-sample t-test     dependent samples t-test     independent samples t-test     ANOVA

In a research study, wherein the researcher wanted to know if people’s intelligence is perceived differently based on race, participants observed either a Caucasian, African American, or Asian American stimulus person giving a speech. All stimulus persons gave the same verbal speech. After observing this person, the participants had to rate the stimulus person’s level of intelligence on a scale of 1-10. The participants were separated by gender and their ratings were analyzed separately. How many possible interaction effects might the researcher find? Group of answer choices 3 0 1 2

A study is testing the effectiveness of a new allergy medication. Sixty people who reported they experience allergies were randomly assigned to one of two groups: one with the new medication, and another with a placebo. After two weeks, the subjects were surveyed by technicians to determine their level of allergic symptoms. Which of the following would benefit this experiment the most? A. This experiment should be double blind. Neither the subject nor the technician should know which group is receiving the new medication and which is receiving the placebo. This method would control for the placebo effect and prevent any effect on the response. B. This experiment should be single blind. The subjects do not know which treatment they are receiving to control for the placebo effect, but the technicians need to know which group received which treatment. C. This experiment should be single blind. The subjects know which treatment they are receiving but the technicians do not know which…

A psychologist is interested in whether hypnosis affects mood and emotion.  12 college students from the freshmen class are randomly sampled for an experiment.  The experiment has two conditions which are given on different days.  In condition 1, the students are hypnotized and then given a questionnaire which measures the levels of positive emotion.  The higher the score indicates higher levels of positive emotion.  In condition 2, the same students are given the questionnaire again, only this time they are not hypnotized but are in their normal state of consciousness.  The following scores are obtained.   Student 1 2 3 4 5 6 7 8 9 10 11 12 Condition 1 30 17 23 28 43 28 16 15 13 17 21 31 Condition 2 24 3 14 11 15 12 4 10 29 14 10 22   (hint: refer to "Week 8 quiz_ answer key and solution" document on Blackboard)   The non-directional alternative (H1) hypothesis is _________.     hypnosis…

A psychologist develops an intervention designed to reduce test anxiety associated with taking the SAT. The psychologist claims that reduced test anxiety will lead to higher scores on the quantitative section of the SAT. Because she believes all students experience some degree of anxiety related to the SAT, she further claims her intervention should work for all students, not just those who report abnormal levels of test anxiety. She randomly selects 30 high school juniors, and with the consent of their parents, delivers her intervention. Subsequently, these students take the SAT, and she collects their scores. The quantitative section of the SAT has a mean of 500 and a standard deviation of 100 in the general population, and scores are normally distributed. a. What type of test should be used to analyze her data? i. Z-test ii. Single-sample t-test iii. Independent-measures t-test iv. Repeated-measures t-test b. What would the hypotheses be?

Inspired by the example about how background music influences choice of entrée at a restaurant, a statistics student decided to investigate other ways to influence a person's behavior. Using 60 volunteers, she randomly assigned 20 volunteers to get a "red" survey, 20 volunteers to get a "blue" survey, and 20 volunteers to get a control survey. The first three questions on each survey were the same, but the fourth and fifth questions were different. For example, the fourth question on the "red" survey was "When you think of the color red, what do you think about?" On the blue survey, the question replaced red with blue. On the control survey, the last two questions were not about color. As a reward, each volunteer was allowed to choose a chocolate candy in a red wrapper or a chocolate candy in a blue wrapper. The table shows the result of the experiment. We want to test Ho: The distribution of candy choice is the same for subjects like these who receive the red survey, the blue survey,…