The distribution of scores on a standardized test is approximately Normal with a standard deviation of σ = 22. If a sample of 140 students had a mean score of x¯ = 76.8, use this to find a 99% confidence interval for the mean score of all students on this test. We are 99% confident that the mean score of students on this test was in the interval (Answer) to ( Answer) What is the margin of error for your confidence interval? Margin of error=
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.
The distribution of scores on a standardized test is approximately Normal with a standard deviation of σ = 22. If a sample of 140 students had a
We are 99% confident that the mean score of students on this test was in the interval
(Answer) to ( Answer)
What is the margin of error for your confidence interval?
Margin of error=
What is the margin of error for your confidence interval?
Margin of error =
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