Question

In: Statistics and Probability

A researcher randomly divides 19 subjects into two groups. One group receives a new drug called...

A researcher randomly divides 19 subjects into two groups. One group receives a new drug called RT56 for 3 months, the other a placebo (looks like RT56, but is a sugar pill). She then measures reaction time (RT) on a complex task and finds the following RT s in seconds (s): Group 1 Group 2 RT56 Placebo N=10 N=9 .456 .532 .347 .458 .435 .768 .234 .643 .521 .678 .411 .569 .398 .486 .254 .647 .391 .501 .289 1. State the independent and dependent variables. 2. State the Null Hypothesis in words and symbols. 3. Compute the appropriate statistic. 4. What is the decision? 5. State the full conclusion in words.

Solutions

Expert Solution

Here Reaction time is dependent variable and treatment group like placebo and RT56 are independent variable.

Step1:
Null Hypothesis (Ho): The average reaction time is the same between the placebo group and RT56 group.

Alternative Hypothesis (H1): The average reaction time is different between the placebo group and RT56.

We conclude that the average reaction time is different between the placebo group and RT56.

orchestra answered 2 years ago
Next > < Previous

Related Solutions

A researcher randomly divides 19 subjects into two groups. One group receives a new drug called...
A researcher randomly divides 19 subjects into two groups. One group receives a new drug called RT56 for 3 months, the other a placebo (looks like RT56, but is a sugar pill). She then measures reaction time (RT) on a complex task and finds the following RT s in seconds (s): Group 1 Group 2 RT56 Placebo N=10 N=9 .456 .532 .347 .458 .435 .768 .234 .643 .521 .678 .411 .569 .398 .486 .254 .647 .391 .501 .289
A researcher randomly assigns 33 subjects to one of three groups. Group 1 receives technical dietary...
A researcher randomly assigns 33 subjects to one of three groups. Group 1 receives technical dietary information interactively from an on-line website. Group 2 receives the same information from a nurse practitioner, while Group 3 receives the information from a video made by the same nurse practitioner. The researcher looked at three different ratings of the presentation: difficulty, usefulness, and importance to determine if there is a difference in the modes of presentation. In particular, the researcher is interested in...
A researcher randomly assigns 33 subjects to one of three groups. Group 1 receives technical dietary...
A researcher randomly assigns 33 subjects to one of three groups. Group 1 receives technical dietary information interactively from an on-line website. Group 2 receives the same information from a nurse practitioner, while Group 3 receives the information from a video tape made by the same nurse practitioner. The researcher looked at three different ratings of the presentation; difficulty, usefulness, and importance to determine if there is a difference in the modes of presentation. In particular, the researcher is interested...
To test the effectiveness of a new drug, a researcher gives one group of randomly selected...
To test the effectiveness of a new drug, a researcher gives one group of randomly selected individuals the new drug and another group of randomly selected individuals a placebo. The results are shown in the table below. Drug 32 (effective) 9 (ineffective) Placebo 12 (effective) 18 (ineffective) At 0.05, can the researcher conclude that the drug results differ from those of the placebo? (Show ALL steps including conditions).
An educational psychologist randomly divides a sample of students into two groups. In one of the...
An educational psychologist randomly divides a sample of students into two groups. In one of the groups students receive training in a new studying strategy. Then all students are given 30 minutes to study a chapter from a math textbook before they take a quiz on the chapter. The psychologist hypothesizes that the new studying strategy will be more effective. What can the psychologist conclude with α = 0.05? The quiz data are below. training no training 6 4 6...
12 subjects in a study were randomly assigned into two equally sized groups. One group was...
12 subjects in a study were randomly assigned into two equally sized groups. One group was shown a short video on how to fold paper cranes. The other group was given an instruction booklet on how to do so. They were then asked to make paper cranes for the next hour. The number of paper cranes each subject made was recorded and is listed in the table below. The researchers are interested in whether there was a difference in the...
A group of volunteers are randomly divided into two groups. One group of participants takes a...
A group of volunteers are randomly divided into two groups. One group of participants takes a pill each morning for a year which contains antioxidants (Vitamins A, C, E, etc), while the other group takes a placebo pill for the same time period. Following this they are measured on a problem solving task given under stressful conditions. The number of errors is counted during solution. Results were: GROUP 1         GROUP 2 ANTIOXIDANTS PLACEBO (CONTROL) N = 14    ...
To test the effectiveness of a new drug, a researcher gives one group of individuals the...
To test the effectiveness of a new drug, a researcher gives one group of individuals the new drug and another group a placebo. The results of the study are shown here. At α = 0.10, can the researcher conclude that the drug is effective? Use the P value method. Medication                              Effective                                          Not Effective                                                 Obs.,       Exp                                        Obs.,       Esp Drug                                        32                                                      9 Placebo                                   12                                                      18
A medical researcher believes that a drug changes the body's temperature. Seven test subjects are randomly...
A medical researcher believes that a drug changes the body's temperature. Seven test subjects are randomly selected and the body temperature of each is measured. The subjects are then given the drug, and after 30 minutes, the body temperature of each is measured again. The results are listed in the table below. Is there enough evidence to conclude that the drug changes the body's temperature? Let d=(body temperature after taking drug)−(body temperature before taking drug) d=(body temperature after taking drug)−(body...
A medical researcher believes that a drug changes the body's temperature. Seven test subjects are randomly...
A medical researcher believes that a drug changes the body's temperature. Seven test subjects are randomly selected and the body temperature of each is measured. The subjects are then given the drug, and after 30 minutes, the body temperature of each is measured again. The results are listed in the table below. Is there enough evidence to conclude that the drug changes the body's temperature? Let d=(body temperature after taking drug)−(body temperature before taking drug) . Use a significance level...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT