13. Suppose your roommate believes the mean amount it will cost to repair your dorm refrigerator is more than $50. To determine if she is correct, suppose you perform a hypothesis test with level of significance equal to 5%. For each choice below, determine if you made the correct decision or if you made an error. If an error was made, determine if a Type-I or Type-II error was committed. a. You conclude that the mean amount to repair a dorm refrigerator is more than $50 when in reality the mean amount to repair a dorm refrigerator is not more than $50. b. You conclude that the mean amount to repair a dorm refrigerator is not more than $50 when in reality the mean amount to repair a dorm refrigerator is not more than $50. c. You conclude that the mean amount to repair a dorm refrigerator is not more than $50 when in reality the mean amount to repair a dorm refrigerator is more than $50. d. You conclude that the mean amount to repair a dorm refrigerator is more than $50 when in reality the mean amount to repair a dorm refrigerator is more than $50.
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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