When does a researcher risk Type I error?
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9: When does a researcher risk Type I error?
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- What does aij mean?What is the research hypothesis? a) The stress task will not lead to an increase in stress hormones. OR b) The stress task will lead to an increase in stress hormones.Are freshmen psychology majors just as likely to change their major before they graduate compared to freshmen business majors? 366 of the 673 freshmen psychology majors from a recent study changed their major before they graduated and 394 of the 705 freshmen business majors changed their major before they graduated. What can be concluded at the a = 0.10 level of significance? For this study, we should use z-test for the difference between two population proportions a. The null and alternative hypotheses would be: Ho: p1 p2 v (please enter a decimal) H1: p1 p2 (Please enter a decimal) b. The test statistic z v -0.508 X (please show your answer to 3 decimal places.) c. The p-value = 0.6115 X (Please show your answer to 4 decimal places.) d. The p-value is > vV a e. Based on this, we should fail to reject the null hypothesis. f. Thus, the final conclusion is that ... O The results are statistically significant at a = 0.10, so there is sufficient evidence to conclude that the proportion of…
- 16.Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?Determine whether the results appear to have statistical significance, and also determine whether theresults appear to have practical significance: Bias in Jury Selection In the case of Casteneda v. Partida, it was found that during a period of 11 years in Hidalgo County, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry. Among the people eligible for grand jury duty, 79.1% were Americans of Mexican ancestry.Please explain it step by step, thank you.
- 13. What is the correct decision in a hypothesis if the data produce a t-statistic that is in the critical region?2. A study was conducted to examine the difference between the older and younger adult teachers on perceived life satisfaction. A pilot study was conducted to examine this hypothesis. Ten older adults (over the age of 50) and ten younger adults (between 20 and 40) were given a life satisfaction test (known to have high reliability and validity). Scores on the measure range from 0 to 60 with high scores indicative of high life satisfaction, low scores indicative of low life satisfaction. Result of the analysis is presented below. Older Adults Younger Adults Мean 44.5 28.1 Variance 75.38888889 72.98888889 Observations Hypothesized Mean Difference 10 10 df 18 x Stat P(X<=x) one-tail Critical one-tail P(X<=x) two-tail 4.257546666 0.000236832 1.734063607 0.000473663 x Critical two-tail 2.10092204 5. Is there a significant difference between the two groups? 6. Make a writeup of the result using APA format39. You are interested in further investigating whether there is a causal relationship between stress and sleep quality. а. What type of study design will you choose? Select one: (a) Experimental (b) Quasi-experimental (c) Non-experimental Select one: (a) Retrospective (b) Prospective (c) Cross-sectional Select one: (a) Case-Control (b) Cohort (c) Ecologic (d) Randomized Controlled Trial b. Provide a justification for your selections: c. Identify at least one potential confounding variable. Explain why it may be a confounder and how you might control for it. 40. Answer the following questions regarding sampling method and its relationship to validity. а. What type of sampling method is convenience sampling? Type of sampling method: (a) Probability (b) Non-probability b. How would using a convenience sample affect the external validity of your study? c. How would using a convenience sample affect the internal validity of your study? С.
- What is your interpretation if the result of the test has 2 or more sectors with two or more delays? Untestable Normal Abnormal Questionable5. A new drug to treat psoriasis has been developed and is in clinical testing. Assume that those individuals given the drug are examined before receiving the treatment and then again after receiving the treatment to determine if there was a change in their symptom status. If the initial results showed that 9.0% of individuals entered the study in remission, 74.0% of individuals entered the study with mild symptoms, 13.0% of individuals entered the study with moderate symptoms, and 4.0% entered the study with severe symptoms calculate and interpret a chi-squared test to determine if the drug was effective treating psoriasis given the information below from the final examination.Remission (No Symptoms of Psoriasis)Mild Symptoms of PsoriasisModerate Symptoms of PsoriasisSevere Symptoms of PsoriasisTotal Number of Participants Page 3 of 4to Receive the DrugNumber of Participants4556358571182a. We reject H0 because 1273.142 is greater than 5.99. We have…Identify the correct null hypothesis (from the below choices) for each: 1. A study wished to see if husbands or wives are more satisfied in their marriage. They selected 100 married couples and asked both the husband and wives to rate their satisfaction on a scale of 1 to 10. [Select] 2. A study wished to see if husbands or wives are more satisfied in their marriage. They selected a 100 married men and 100 married women and asked them rate their satisfaction on a scale of 1 to 10. [Select] 3. A study wished to see if husbands or wives are more satisfied in their marriage. From a previous study the average score (from 1 to 10) of wives was 6.5. They selected a sample of 100 married men and asked them to rate their satisfaction on a scale of 1 to 10. [Select]
