Concept explainers
(a)
To Calculate: the z-score and the value means.
(a)

Answer to Problem R2.1RE
Explanation of Solution
Given:
Formula used:
Calculation:
It means that researcher’s means height is 170 cm which is about to the standard deviation 1.20. Height of the researcher’s would be between 168.8 cm and 171.2 cm.
(b)
To Explain: that this means to someone who knows no statistics.
(b)

Explanation of Solution
85th percentile is data point where 85% of the entire data is less than or equal to the data point. It also means that 15% of the data is greater than or equal to the data point so researcher is taller than 85% of the entire population of 15-year old males or shorter than 15% of the entire population of 15-years old males.
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