Researchers at a National weather center in the North Eastern United States recorded the number of 90 degrees, days each year since first started in 1875. The number form a normal shaped distribution with mean of u= 9.6 and standard deviation of sigma = 1.9 to see if the data showed any evidence of global warming, they computed the mean number of 90 degree days for the most recent n= 4 years and obtained zm= 12.25. Do the data indicate that the past four years have significantly more 90 degree days than would be expected for a random sample from this population? Use a one -tailed test with (x = 0.05
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.
Researchers at a National weather center in the North Eastern United States recorded the number of 90 degrees, days each year since first started in 1875. The number form a
Use a one -tailed test with (x = 0.05
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