In the survey of a random sample of students at a university. A professor is interested in whether students who have watched TV ( group 1) in the past week study fewer hours on average per week than those who have not ( group 2). An :analysis of the results produce the following information SD ( standard deviation) Mean n TV 6.50 12.72 40 YES 7.65 15.35 120 NO ?Which of the following is the appropriate test statistics 12.72-15.35 t 3D (6.50)², (7.65 A O 40 120 12.72-15.35 .BO (6.44)2 (8.65)2 45 125 12.72-15.35 C O t%3D V6.50+7.65 None of these .D C 12.41-15.53 E 6.50 7.65 120 40
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.
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