Maya conducted an experiment that tests the hypothesis that "Studying hours have a positive effect on students' midterm grades". Which of the following is true?
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- A researcher wanted to learn more about the relationship between whether or not a student getting less than 8 hours of sleep the night before a test determines whether or not they pass their test the next day. a)What is the explanatory variable in this study? -Whether or not the student passed his/her test -Whether or not a student got less than 8 hours of sleep the night before a test -The number of students who got less than 8 hours of sleep the night before a test -The number of students who passed their test b) What type of relationship is this? -C --> C -Q --> C -Q --> Q -C --> QA researcher has observed 500 vehicles at a stop sign in a suburban neighbourhood and recorded the type of vehicle (sedan, hatchback, bakkie) and driver behaviour at the stop sign (complete stop, near stop, “ran” the stop sign). At the 0.05 level of significance, could there be some relationship between driver behaviour and the type of vehicle being driven? Define the null hypothesis and the alternative hypothesis. A. H1: Driver’s behaviour and type of vehicle are independent vs H0: A relationship exists between driver’s behaviour and type of vehicle B. H0: A relationship exists between driver’s behaviour and type of vehicle vs H1: No relationship exists between driver’s behaviour and type of vehicle C. H0: Driver’s behaviour and dependent on the type of vehicle vs H1: Driver’s behaviour and type of vehicle are independent D. H0: Driver’s behaviour and type of vehicle are independent vs H1: A relationship exists between driver’s behaviour and type of vehicleIn a typical experiment the researcher manipulates the independent or explanatory variable and then observes whether the hypothesized dependent variable is affected by the intervention. Choose any two examples of experiment and describe the independent and dependent variables
- Identify the variable in this test and what type of variable is it (nominal, ordinal or continuous). Then state the null and alternative hypothesis.40 men participating in a study reported how angry they felt at the end of each day for 2 weeks. For the first week 20 of the men were given testosterone supplements and the other 20 were given a placebo. During the 2nd week, the men who were originally given testosterone were switched to the placebo and the men who originally got the placebo were switched to testosterone. What is the dependent variable?What is your variable in this study? State your null hypothesis in words, for this study, and finally state your null hypothesis in symbols for this study.
- In a typical experiment, the researcher manipulates the independent or explanatory variable and then observes whether the hypothesized dependent variable is affected by the intervention. Choose any two examples of experiments and describe the independent and dependent variables.A researcher notes that there seems to be a difference in the prevalence of high cholesterol among individuals who smoke and consume diets high in processed food and the prevalence of high cholesterol among individuals who do not smoke and do not consume diets high in processed foods. Use the appropriate hypothesis to determine if diet and smoking status are related (independent) at the 5%. This is the first step in determining if confounding has influenced the study’s results. Then interpret your response. Diet Low in Processed Foods Normal Cholesterol High Cholesterol Total Non-smoker 124 55 179 Smoker 69 152 221 Total 193 207 400 Diet High in Processed Foods Normal Cholesterol High Cholesterol Total Non-smoker 64 85 149 Smoker 98 153 251 Total 162 238 400 A) The chi square value of 4.65 is higher than the chi square value of 3.84, therefore we can accept H0 at the 5% level and reject…A researcher selects a sample and administers a treatment for anxiety to the individuals in the sample. If the sample is used for a hypothesis test, what does the alternative hypothesis (H1) put forth about the treatment? A. The treatment has no effect on anxiety. B. The treatment adds a constant to each anxiety score. C. The treatment multiplies each anxiety score by a constant. D. The treatment has an effect on anxiety.
- A small clinical pilot study was conducted by a reattach team from Harvard Medical School and the School of Public Health. Fifteen individuals in the early stages of Multiple Sclerosis were fed bovine myelin, a substance containing two antigens thought to be the target of the immune system's attack in Multiple Sclerosis. Another fifteen were given a placebo. In the study, fewer members of the group fed bovine myelin had major attacks of the disease. a.) What is the independent variable? b.) What is the dependent variable? c.) Which group is the treatment group? d.) Which group is the control group? Explain all question.A small clinical pilot study was conducted by a reattach team from Harvard Medical School and the School of Public Health. Fifteen individuals in the early stages of Multiple Sclerosis were fed bovine myelin, a substance containing two antigens thought to be the target of the immune system's attack in Multiple Sclerosis. Another fifteen were given a placebo. In the study, fewer members of the group fed bovine myelin had major attacks of the disease. a.) What is the independent variable? b.) What is the dependent variable? c.) Which group is the treatment group? d.) Which group is the control group Plzz explain all question. Ty.In conducting the t-test for independent means, if you ______, the two means ______. Group of answer choices do not reject the null hypothesis; do not significantly differ from each other do not accept the null hypothesis; are significantly equal to each other reject the null hypothesis; do not significantly differ from each other reject the alternative hypothesis; are significantly different from each other