A manager of a pizza restaurant has changed the restaurant's delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25. minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.3 minutes and a sample standard deviation of 6 minutes. What is the test statistic for this test? t Stat= ___ What is(are) the critical value(s) for this test? ___ What is the conclusion for this test? Since the test statistic is __A__ than the critical value, __B___ the null hypothesis and conclude that there is __C__ evidence that the population mean delivery time has been reduced below the previous population mean value of 25 minutes. A: less or greater B: do not reject or reject C: sufficient or insufficient
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.
A manager of a pizza restaurant has changed the restaurant's delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25. minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.3 minutes and a sample standard deviation of 6 minutes.
What is the test statistic for this test?
t Stat= ___
What is(are) the critical value(s) for this test?
___
What is the conclusion for this test?
Since the test statistic is __A__ than the critical value, __B___ the null hypothesis and conclude that there is __C__ evidence that the population mean delivery time has been reduced below the previous population
A: less or greater
B: do not reject or reject
C: sufficient or insufficient
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