Fast Food Drive-Through Service Times Listed below are drive-though service times (seconds) recorded at McDonald's during dinner times (from Data Set 25 "Fast Food" in Appendix B). Assuming that dinner service times at Wendy's have standard deviation σ=55.95 sec, use a 0.01 significance level to test the claim that service times at McDonald's have the same variation as service times at Wendy's. Should McDonald's have the same variation as service times at Wendy's Should McDonald's take any action? 121 119 146 266 333 308 333 308
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.
Fast Food Drive-Through Service Times Listed below are drive-though service times (seconds) recorded at McDonald's during dinner times (from Data Set 25 "Fast Food" in Appendix B). Assuming that dinner service times at Wendy's have standard deviation σ=55.95 sec, use a 0.01 significance level to test the claim that service times at McDonald's have the same variation as service times at Wendy's. Should McDonald's have the same variation as service times at Wendy's Should McDonald's take any action?
121 119 146 266 333 308 333 308
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