TInterval (6.17,7.57) x = 6.87 Sx = 13.83 n=1050.00
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.
When a survey asked "About how many hours per week do you spend sending and answering e-mail?", the summary statistics were as shown in the graphing calculator screen shot. Complete parts a through c below.
What is the margin of error at the 90% confidence level for the point estimate of the mean number of hours?
The margin of error is ( )
(Round to two decimal places as needed.)
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