A fast-food restaurant monitors its drive-thru Speed of Service (Time in Seconds) O 108 service times electronically to ensure that its speed of service is meeting the company's goals. A sample of 16 drive-thru times was recently taken and is shown to the right. 110 101 119 120 95 123 133 112 102 116 109 101 128 100 130 a. Construct a stem and leaf diagram of the speed of service times. b. What range of time might the restaurant say is the most frequent speed of service? a. Complete the stem and leaf diagram below. 10 11 12 13 (Use ascending order.) b. The range of time between seconds is the most frequent speed of service. 130 and 139 100 and 109 90 and 99 120 and 129 110 and 119 Enter your answer in each of the answer boxes.
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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