A researcher is testing the effect of a new medication for depression. A sample of n...
A researcher is testing the effect of a new medication for depression. A sample of n = 9 college students is obtained and each student is given a normal dose of the medicine for a period of four weeks. Following this, each student’s level of depression is measured using a standardized instrument used to screen for major depressive disorder. The scores on this instrument for the nine students are as follows: 5, 7, 9, 5, 6, 12, 4, 4, 2.
a.) Assuming that scores for students with depression in the regular population average μ = 10, are the data sufficient to conclude that the medication has a significant effect on depressive symptoms?
Test at α = .05, two-tailed.
b.) Then, Compute r2, the percentage of variance explained by the treatment effect.
c.) Write a sentence demonstrating how the outcome of the hypothesis test and the measure of effect size would be presented in a research report.
Homework Answers
Add Answer to:
A researcher is testing the effect of a new medication for
depression. A sample of n...
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental...
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n= 18 participants is obtained, and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population, scores on the simulation task are normally distributed with μ = 60. The individuals in the sample had an average score of M = 54 and an s = 8....
please show how you arrive at the answer 2. A researcher is testing the effect of a new cold and flu medication on r...
please show how you arrive at the answer
2. A researcher is testing the effect of a new cold and flu medication on reaction time. A sample of n 16 students is obtained and each student is given the normal dose of the medicine. Thirty minutes later, each student's reaction time is measured. The scores for the sample averaged 3. A biopsychologist studies the role of the brain chemical serotonin in aggression. One sample of rats serves as a control...
To evaluate the effect of a treatment, a sample of n-8 is obtained from a population...
To evaluate the effect of a treatment, a sample of n-8 is obtained from a population with a mean of ?-50, and the treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M 55. a) If the sample variance is s-32, use a two-tailed test with ?-0.05 to determine whether the treatment effect is significant and compute Cohen's d b) If the sample variance is s- 72, repeat the test and...
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental...
A researcher would like to determine whether an over-the-counter cold medication has an effect on mental alertness. A sample of n = 25 participants is obtained, and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population, scores on the simulation task are normally distributed with μ = 58 and σ = 20. The individuals in the sample had an average score of M = 56....
A researcher would like to determine whether an over-the-counter herbal nasal spray has an effect on...
A researcher would like to determine whether an over-the-counter herbal nasal spray has an effect on mental alertness for infants. A sample of n = 16 infants is obtained, and each baby is given a standard dose of the spray one hour before being tested for mental alertness. For the general population of infants, scores on a mental alertness screening test are normally distributed with μ = 60. The infants in the sample had an average score of M =...
Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To...
Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To test this claim, a researcher selects a sample of n = 25 college students. Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test. For the population, scores on the test are normally distributed with μ = 75 and σ = 5. The sample of n = 25 students had a...
Focusing on the last part 41. Gravetter/Wallnau/Forzano, Essentials-Chapter 8-End-of-chaptor question 15 Aa Aa A high school...
Focusing on the last part
41. Gravetter/Wallnau/Forzano, Essentials-Chapter 8-End-of-chaptor question 15 Aa Aa A high school teacher has designed a new course intended to help students prepare for the mathematics section of the SAT. A sample of n -20 students is rearuited to take the course and, at the end of the year, each student takes the SAT. The average score for this sample is M 562. For the general population, scores on the SAT are standardized to form a...
A sample of 10 mothers wants to know if they sleep less than the population in...
A sample of 10 mothers wants to know if they sleep less than the population in terms of the number of hours they sleep. Their average number of hours they sleep is 6.8. We know that the average hours of sleep in the population is 8 with a standard deviation of 3. Conduct a z test to see if the sample of mothers differs from the population. (Be sure to complete all four steps of a hypothesis test.) α=.05 Ackerman...
Question 5 A researcher wants to find out the effect of marriage on the self‐esteem of...
Question 5 A researcher wants to find out the effect of marriage on the self‐esteem of couples. He measured the average self‐esteem scores of couples before marriage and a year after their wedding day. Their average self‐esteem scores are shown below. Pair After one year Before marriage A 14 8 B 16 4 C 18 10 D 10 10 E 9 9 F 16 9 Is there a significant difference in the self‐esteem scores before marriage and a year after...
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey,...
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness. A sample of n = 8 college students is obtained, and each student’s performance on a familiar video game (total points earned in the game) is measured before and after eating a traditional Thanksgiving dinner including roast turkey. The following table are the scores for each participant before and after the meal: Participants: 1,2,3,4,5,6,7,8, Before Meal (X1): 220,245,215,260,300,280,250,310 After Meal...
please show how you arrive at the answer
2. A researcher is testing the effect of a new cold and flu medication on reaction time. A sample of n 16 students is obtained and each student is given the normal dose of the medicine. Thirty minutes later, each student's reaction time is measured. The scores for the sample averaged 3. A biopsychologist studies the role of the brain chemical serotonin in aggression. One sample of rats serves as a control...
To evaluate the effect of a treatment, a sample of n-8 is obtained from a population with a mean of ?-50, and the treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be M 55. a) If the sample variance is s-32, use a two-tailed test with ?-0.05 to determine whether the treatment effect is significant and compute Cohen's d b) If the sample variance is s- 72, repeat the test and...
Focusing on the last part
41. Gravetter/Wallnau/Forzano, Essentials-Chapter 8-End-of-chaptor question 15 Aa Aa A high school teacher has designed a new course intended to help students prepare for the mathematics section of the SAT. A sample of n -20 students is rearuited to take the course and, at the end of the year, each student takes the SAT. The average score for this sample is M 562. For the general population, scores on the SAT are standardized to form a...
Most questions answered within 3 hours.
-
Starting with benzene, synthesize 1-phenyl-1-butyne.
Show intermediates and reagents.
asked 34 minutes ago -
Create a 32-run crossed array design with six control factors
and two noise factors such that...
asked 1 hour ago -
A 500g sample of sand from source A has the following amounts
retained on each sieve....
asked 1 hour ago -
In
your own words, please explain the essay by John Keynes wrote "The
End of Laissez...
asked 1 hour ago -
How are the matrix and pixels related? Why are smaller
pixels better for diagnostic quality?
asked 1 hour ago -
2. An AC generator has 80 rectangular loops on
its armature. Each loop is 11 cm...
asked 1 hour ago -
Please help me with this question. Consider Aldi’s current and
potential geographic markets (see Exhibit 4...
asked 1 hour ago -
What are the main components of the fermentation process and
give an explanation of each? Include...
asked 2 hours ago -
Explain which types of cells in the body (belonging to which
organs, etc.) are sensitive to...
asked 2 hours ago -
A single cable supports an 703-kg elevator car. What is the
tension in the cable when...
asked 2 hours ago -
among the three different ways to link CSS specifications to an
HTML document (inline CSS, document...
asked 2 hours ago -
(1) Write the net ionic equation for the reaction that occurs
when equal volumes of 0.191...
asked 2 hours ago