# Statistics

posted by Jenn

Williams, Dunsiger, Jennings, and Marcus (2012) conducted a study to test how enhanced mood during exercise can increase the likelihood of physical activity in the future. They reported that at 6 months of physical activity, mood scores (rated on a scale from -5 to +5) after a walking exercise were 3.3 ± 1.2, and after 12 months, mood scores after a walking exercise were 3.3 ± 1.3 (mean ± standard error). Assuming these data are normally distributed, use the steps to conduct a z transformation to determine the following probabilities:

(a) What is the probability that a sample mean selected from this population would show no change (0) or a negative change (less than 0) at 6 months of physical activity?

(b) What is the probability that a sample mean selected from this population would show no change (0) or a negative change (less than 0) at 12 months of physical activity?

1. PsyDAG

Unless there are typos, with the means the same, there was no difference.

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√n

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

2. ggfdfd

huhcsuhcx

3. kayy

hjhghgj

## Similar Questions

1. ### Psychology/Statistics

I have a quick question for you all. I have done a repeated measures ANOVA for hypothetical data in my Stats class. There were 5 subjects.. all subjects rated their mood on a cloudy day, then they all rated their mood on a sunny day. …
2. ### English

What is the verb mood of the sentence? Wear your coat when you are in the snow. indicative mood imperative mood subjunctive mood
3. ### 9

What can health care providers do to help promote physical activity initiatives?
4. ### 12

The new Physical Activity Guidelines for Americans allows a person to accumulate 150 minutes a week ________. A. By engaging in 30 minutes of physical activity for 5 days a week only B. By engaging in 50 minutes of physical activity …
5. ### Health

What can health care providers do to help promote physical activity initiatives?
6. ### Physical Edu

The principle of progressive overload is described by an improvement in physical fitness which requires a gradual increase in physical activity and working the body beyond accustomed levels. is it True
7. ### Statistics

Please help, thank you!! A researcher measures how positive a person’s mood is and how creative he or she is, obtaining the following interval scores: Participant Mood X Creativity Y 1 10 7 2 8 6 3 9 11 4 6 4 5 5 5 6 3 7 7 7 4 8 …
8. ### Physical Education

I have 3 questions and 3 of my answers. Each question needs 2 answers. Please review them all. Thank you. I will post 3 more questions with 3 of my answers later this day, and the answers will just be made up along the way. I changed …
9. ### children's literature

Creativity supports problem solving in children and is what type of activity?
10. ### english

In what mood (or case) are the following sentences?

More Similar Questions