Faced with rising fax costs, a firm issued a guideline that transmissions of 9 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 9 or below. The firm examined 25 randomly chosen fax transmissions during the next year, yielding a sample mean of 10.84 with a standard deviation of 3.07 pages. (a-1) Find the test statistic. (Round your answer to 4 decimal places.) The test statistic _____ (a-2) At the .01 level of significance, is the true mean greater than 9? multiple choice No Yes
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.
Faced with rising fax costs, a firm issued a guideline that transmissions of 9 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 9 or below. The firm examined 25 randomly chosen fax transmissions during the next year, yielding a sample
(a-1) Find the test statistic. (Round your answer to 4 decimal places.)
The test statistic _____
(a-2) At the .01 level of significance, is the true mean greater than 9?
multiple choice
-
No
-
Yes
(b) Use Excel to find the right-tail p-value. (Round your answer to 4 decimal places.)
p-value ____
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