You are a representative of Samsung who is responsible for marketing the new Galaxy. A lot of money was spent by Samsung to improve their battery life compared to Apple's latest iPhone. You are given funds to test 20 of each type of phone. Based on your sample of Galaxy S21, you find an average battery life of 11.5 hours with a standard deviation of 1.78 hours. For the sample of iPhone 12, you find an average battery life of 15 hours with a standard deviation of 3.2 hours. Construct a hypothesis test (alpha of .05) to determine if the Galaxy S21's battery life is different.
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.
You are a representative of Samsung who is responsible for marketing the new Galaxy. A lot of money was spent by Samsung to improve their battery life compared to Apple's latest iPhone. You are given funds to test 20 of each type of phone. Based on your sample of Galaxy S21, you find an average battery life of 11.5 hours with a standard deviation of 1.78 hours. For the sample of iPhone 12, you find an average battery life of 15 hours with a standard deviation of 3.2 hours. Construct a hypothesis test (alpha of .05) to determine if the Galaxy S21's battery life is different.
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