A field test for a new exam was given to randomly selected seniors. The exams were graded and the sample mean and sample standard deviation were calculated. Based on the results the exam creator claims that on the same exam nine times out of ten seniors will have an average score within 4% of 81% what is the margin of error? Calculate the confidence interval and explain what it means in the term of the situation. Please help I don’t understand and a step by step explanation would be greatly appreciated
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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