A manager took the average age of customers who showed at a store a certain number of days per month. Given the following graph, what can be stated about the average age of the customers by the number of days per month they go to the store? Age of Regular Customers 45 40 35 30 25 20 15 10 1 3 4 5 7 8 10 11 Days in the Store 2018 Glynlyon, Inc. O The number of days a customer spends in the store generally decreases as the customer's age increases. O The number of days a customer spends in the store generally increases as the customer's age increases. O Customers older than 30 usually spend more days in the store on average than customers younger than 30. O Customers younger than 30 usually spend more days in the store than customers older than 30. Average Age
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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