A group of 500 patients who suffer from migraine headaches is asked to participate in a study to determine the effectiveness of a new medication. The patients are divided randomly into two groups, one was given the actual medication and one received a placebo pill. After 6 months of treatment, 65% of the patients who took the medication had fewer migraines, while only 35% of those who took the placebo had fewer migraines. a. What is the treatment variable? b. What is the response (or outcome) variable? C. Was this an observational study or a controlled experiment? Explain how you know

Q: In a study of reading comprehension, sixth grade students read a short story about baseball. The…

A: Given,   Low Baseball High Baseball Low IQ-V 20 25 High IQ-V 20 30

Q: a) Name the experimental units. b) Name the response variable(s). c) Name the factor(s) or…

A: here we have to find a) Name the experimental units.b) Name the response variable(s).c) Name the…

Q: A medical journal reported on an experiment intended to see if a certain drug could be used as a…

A: Since you have posted a question with multiple sub-parts, we will solve the first 3 sub-parts for…

Q: In a study recently published in a health journal, it was suggested that lack of exercise…

A: In this case, the study indicates whether the lack of exercise contributed more to weight gain that…

Q: Suppose a study examines the relative efficacy of penicillin and spectinomycin in treating gon-…

A: As in this question researchers want to see if there is an association between the type of treatment…

Q: An educational psychologist studies the positive effect of frequent testing on retention of class…

A: For the group exposed to frequent quizzes,The sample size, n1=11The sample mean of the final exam…

Q: rs, study components. Researchers studying the relatio control conducted an experiment on 160…

A: (a) The research question of a study is defined as the question which is required to obtain through…

Q: A group of 500 children who sufler from asthma were asked to participate in a study to determine the…

A: Solution

Q: Does being part of a support group affect the ability of people to quit smoking? A county health…

A:

Q: To check pain-relieving medications for potential side effects on blood pressure, it is decided to…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: A researcher is interested in the relationship between caffeine consumption and headaches in…

A: We want to find the relation between caffeine consumption and headaches for American women aged 25…

Q: Cocaine addiction is very hard to break. Even among addicts trying hard to break the addiction,…

A: Given information: It is given that a study was conducted to investigate the effectiveness of two…

Q: Fifteen years ago, a complete survey of all undergraduate students at a large university indicated…

A: The data set is: 6.2, 7.1, 7.3, 6.8, 6.6, 7, 7.5, 6.8, 6.4, 6.5, 7.1, 7.3 and 6.8 The hypotheses…

Q: Treatment for depression: Researchers conducted a study of 18 patients whose depression had not…

A: Given that: Sample size, n=18

Q: In a study, investigators surveyed individuals by telephone about how often they get tension…

A: Proportions of confidence interval: The following is the formula for confidence interval of the…

Q: Dr. House is leading a study to determine whether a new drug could significantly improve memory loss…

A: Dr. House is leading a study to determine whether a new drug could significantly improve memory loss…

Q: Car Window Skin Cancer? A study suggests that exposure to UV rays through the car window may…

A:

Q: A recent study randomly selected women from various countries around the world and collected…

A:

Q: According to a study on the effects of smoking by pregnant women on rates of asthma in their…

A: Population proportion 22.2%Given sample size n=319Number of children among who developed asthma…

Q: Beer and blood alcohol content: Many people believe that gender, weight, drinking habits, and many…

A: The provided scatter plot indicates the relationship between the cans of beer (defined on the…

Q: A researcher is trying to develop a treatment for a new viral disease. He recruits 100 patients who…

A: In correlational research design, the researcher has control over the variables in the study and…

Q: A researcher conducts an independent-measures study examining how the brain chemical serotonin is…

A: A. Null and alternate hypotheses: The investigator is specifically interested to test whether the…

Q: In a large clinical trial, 391,160 children were randomly assigned to two groups. The treatment…

A:

Q: An experiment was conducted to examine the performance (as measured by the number of errors made) on…

A: Given information: The data represents the number of errors made on a motor skills task for 2…

Q: A local pasty company ran a taste test with 3 different pasty recipes. The study consisted of 60…

A: Choice of Statistical Test depends on several factors.

Q: Ear infections A new vaccine was recently tested to seeif it could prevent the painful and recurrent…

A: Given info: In a medical survey, one year old babies were randomly divided in two groups. One group…

Q: b) Fill in the expected values, round answers to at least 2 decimal places. Expected Pain Free: Yes…

A: (b)

Q: An experiment was conducted to examine the performance (as measured by the number of errors made) on…

A: Consider the given data:     Difficulty         Easy Hard Age Young 7 7 4 6 3 8 5 9…

Q: Can you tell me if my answer to this question on my homework assignment is correct and provide an…

A: Here A hypothesis test of a clinical trail has done comparing a new pain reliever for arthritis to a…

Q: A school superintendent wants to know the effects of a four week anti-bullying course on high school…

A:

Q: Does being part of a support group affect the ability of people to quit smoking? A county health…

A: (a) The 2 x 2 contingency table is given as follows:   Received nicotine patch +Met support group…

Q: A study is conducted to investigate the relationship between owning pets and happiness. 100 subjects…

A: Given Information: A study is conducted to investigate the relationship between owning pets and…

Q: to know if any of the gifts were more or less popular or were they equal in preference.  The data…

A: If Chi square critical > chi square calculated then we fail to reject the null, there is not a…

Q: According to a study on the effects of smoking by pregnant women on rates of asthma in children, for…

A: n= 319 no of children developed asthma = x = 82Population proportion of children who developed…

Q: A researcher wants to determine if preschool attendance is associated with high school graduation…

A: Here we have to identify the correct response variable in this study