A researcher wants to look at how exercise affects mood. she anticipates that exercising more will...

A researcher wants to look at how exercise affects mood. she anticipates that exercising more will improve mood. she has a group of participants run for 30 minutes and then has them rate how happy they feel on a scale from 0-10 and obtains the following scores: 9,7,8,5,7,6,4. The population mean on this Likert scale is 5. Use a t-test to determine if the treatment is statistically significant/you should reject the null hypothesis at the .05, .01, and .001 p-values.

Expert Solution

A Likert-type question (or ‘item’) asks respondents to select one of several (usually four or five) responses that are ranked in order of strength. Here’s an example:

Indicate what you think about the following statements using the scale below:
(1) Strongly Agree; (2) Agree; (3) Neither agree nor disagree; (4) Disagree; (5) Strongly Disagree

a. Apples are rubbish	1	2	3	4	5
b. Yoghurt is my favourite food	1	2	3	4	5
c. Beans are evil	1	2	3	4	5
d. Fish fingers and custard taste great	1	2	3	4	5

Each of these items measures a variable, i.e., a construct about which we want to learn more. Sometimes, sets of similar items are dispersed in the same questionnaire. This helps researchers to probe different aspects of the same construct (or ‘latent variable’), by putting together information from all the related items. I will not go into any of this in more detail here, but if you want to find out more, this posthas some additional information.

Likert scales are very frequently used to measure constructs like satisfaction rates, attitudes towards different things, and more. They are very flexible and very useful, provided you use them carefully.

Hayet Jeridi answered 8 months ago

A animal behaviorist wants to know how exercise affects behavior of aggressive dogs. She finds a...

A animal behaviorist wants to know how exercise affects behavior of aggressive dogs. She finds a sample of 30 aggressive dogs and randomly divides them into three groups. Over one week, one group is exercised for 20 minute per day, one for one hour per day, and one for 2 hours per day. The number of aggressive behaviors (lunging, biting, snarling, etc.) is recorded for the dogs in each group. State the population(s) of interest. Identify the parameter(s) of interest....

A researcher is interested in how music can impact exercise. She wants to know if different...

A researcher is interested in how music can impact exercise. She wants to know if different types of music affect how many pushups a group of adolescents can do. She randomly assigns 20 adolescents to one of three groups: control (Other usual sounds you would hear at a gym), pop music, or hip-hop. Participants listen to their respective tracks starting 2 minutes before an assistant waves their arm to begin. The research assistant counts the number of pushups each participant...

A researcher claims that New Zealanders spend more time exercising than Australians. The researcher takes a...

A researcher claims that New Zealanders spend more time exercising than Australians. The researcher takes a random sample of 41 New Zealanders and finds that they spend an average of 130 minutes per day exercising, with a standard deviation of 24. A sample of 61 Australians averaged 110 minutes a day of exercise, with a standard deviation of 16. Assuming equal variances, test the claim that New Zealanders exercise more than Australians at the 0.05 significance level. Assuming unequal variances,...

1. A researcher wants to know what kind of exercising is most likely to lead to...

1. A researcher wants to know what kind of exercising is most likely to lead to improve people’s moods. He has participants engage in one month of regular workouts (cardio, weight training, or yoga) and then has them complete a mood measure (1-10, higher scores = better mood). Is there a significant difference in groups? Hand calculate the ANOVA using a significance level of .05 and then check your work using SPSS. Cardio Weights Yoga 8 9 7 7 5...

a Sports psychologist wants to know if weight training leads to more positive mood. To assess...

a Sports psychologist wants to know if weight training leads to more positive mood. To assess the effects of weight training on the mood, she obtain a sample of 10 people who had never trained and measured their mood. She then instructed them proper weight training techniques and had him follow a training program for one month. At the end of the month the participants mood was measured again. The mood scale was scored such that higher numbers will indicate...

3) A concession manager at Yankee Stadium wants to know how temperature affects beer sales. She...

3) A concession manager at Yankee Stadium wants to know how temperature affects beer sales. She took a sample of 10 games and recorded the number of beers sold and the temperature in the middle of the game. Temperature 80 68 78 79 87 74 86 92 77 84 Number of Beers 20533 1439 13829 21286 30985 17187 30240 87596 9610 28742 a. Draw a scatter plot of the data. b. The manager estimates the regression equation to be: numberofbeers...

post and pre exercise and how it affects the lungs

What the condition is, what the condition does, how it affects movement or exercise, and how it affects daily life.

What the condition is, what the condition does, how it affects movement or exercise, and how it affects daily life. a) Traumatic Brain Injury (TMI) b) General Intellectual Disability c) Down's Syndrome d) Peripheral Arterial Disease e) Type II Diabetes

A researcher wants to test the hypothesis that increasing temperature and physical exercise increases the body’s...

A researcher wants to test the hypothesis that increasing temperature and physical exercise increases the body’s skin conductivity (as measured by a galvanometer). A sample of 24 males, all 21 years old is randomly selected, and the subjects are randomly assigned to four treatment conditions. Group A is subjected to high temperature and physical exercise (jogging in place for 10 minutes). Their GSR (Galvanic skin response) scores in decivolts are 9, 8, 8, 10, 7, and 8. Group B is...

A researcher wants to see if she can confidently claim that over 20% of students are...

A researcher wants to see if she can confidently claim that over 20% of students are transfering. she will randomly sample 600 students. She decides to reject H0 if if p^ > 0.2335 where Ha: p > 0.20 a) For the test she set up, find the probabilty of making a type II error if the true population proportion is 17%. b) For the test she set up, find the probability of making an error of the appropriate type if...

Question