Cholesterol level ~ Cholesterol level tends to increase with age in both women and men. A medical researcher wants to use statistical inference to determine if average cholesterol level for women over 60 years is lower than men over 60 years. She randomly samples 110 women and 120 men who are over 60 years. The summary statistics are given in the table below in mg/dL. Population/Group Gender Mean cholesterol level Standard deviation 1 Women 196.9 39.8 2 Men 205.4 41.9 The medical researcher uses an appropriate hypothesis test. What is the test statistic for this hypothesis test? Give your answer to 4 decimal places.

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A:

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Q: standardized test statistic?  What is the P Value?

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Q: What is the value of the test statistic? (Rounded to three decimal places.)

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.