A U.S. Web Usage Snapshot indicated a monthly average of 36 Internet visits a particular website per user from home. A random sample of 30 Internet users yielded a sample mean of 38.5 visits with a standard deviation of 5.3. At the 0.02 level of significance can it be concluded that this differs from the national average? Assume the population is normally distributed. Find the P-value. Round answer to four decimal places. Make a decision and summarize your conclusion.
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 U.S. Web Usage Snapshot indicated a monthly average of 36 Internet visits a particular website per user from home. A random sample of 30 Internet users yielded a sample mean of 38.5 visits with a standard deviation of 5.3. At the 0.02 level of significance can it be concluded that this differs from the national average? Assume the population is
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