For parts (a) and (b) below, choose the correct description. Fill in the blanks as necessary. (a) A local store is keeping track of service times. The table below shows the number of customers served and the time it took. Number of customers 31 9 Time (in minutes) 12 36 O It does not always take the same amount of time to serve each customer. O It appears to take the same amount of time to serve each customer. Predicted amount of time to serve 10 customers: |l minutes (b) Customers of a certain credit card earn points for using the card. The table below shows the number of points earned for the amount spent. Number of points 27 36 81 Dollars spent 3 9. O Each dollar spent does not always earn the same number of points. O Each dollar spent appears to earn the same number of points. Predicted amount spent to earn 90 points: $
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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