The following sample (n=15) times between keystrokes were recorded when a user typed the username and password: 0.24, 0.32, 0.38, 0.43, 0.37, 0.38, 0.22, 0.41, 0.33, 0.25, 0.25, 0.46, 0.48, 0.46, 0.34 seconds. Find the mean ,median and standard deviation A longtime authorized user of the account makes 0.25 seconds between keystrokes. if the sample data above are recorded as someone typed the correct username and password. What is the test's critical value (table value) for rejection decision on the evidence of an unauthorized attempt or not (H0=:μ=0.25H0=:μ=0.25 versus H0=:μ≠0.25H0=:μ≠0.25? (At a 5% level of significance).
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.
The following sample (n=15) times between keystrokes were recorded when a user typed the username and password:
0.24, 0.32, 0.38, 0.43, 0.37, 0.38, 0.22, 0.41, 0.33, 0.25, 0.25, 0.46, 0.48, 0.46, 0.34
seconds. Find the
A longtime authorized user of the account makes 0.25 seconds between keystrokes. if the sample data above are recorded as someone typed the correct username and
password. What is the test's critical value (table value) for rejection decision on the evidence of an unauthorized attempt or not (H0=:μ=0.25H0=:μ=0.25 versus H0=:μ≠0.25H0=:μ≠0.25? (At a 5% level of significance).
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