A researcher conducts a "between-subjects" study examining the effectiveness of a group exercise program at an assisted living facility for elderly adults. One group of residents is selected to participate in the program, and the second group of participants serves as a control group. After 6 weeks, the researcher reports a combined score measuring balance & strength for each individual. The data is below: Control Exercise n = 10 n = 15 M = 12 M = 15.5 SS = 120.5 SS = 190.0 a.) Does the exercise program have a significant effect? Use a two-tailed test with an alpha level of .05 b.) Compute Cohen's d to measure the size of the treatment effec
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
A researcher conducts a "between-subjects" study examining the effectiveness of a group exercise program at an assisted living facility for elderly adults. One group of residents is selected to participate in the program, and the second group of participants serves as a control group.
After 6 weeks, the researcher reports a combined score measuring balance & strength for each individual. The data is below:
Control Exercise
n = 10 n = 15
M = 12 M = 15.5
SS = 120.5 SS = 190.0
a.) Does the exercise program have a significant effect? Use a two-tailed test with an alpha level of .05
b.) Compute Cohen's d to measure the size of the treatment effect
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