I need help with 2.120 I need help with 2.120 data set and that their z-scores a

Question

I need help with 2.120 I need help with 2.120 data set and that their z-scores are -2 and 3, respectively. Using only this information, is it possible to determine the population's mean and standard deviation? If so, find them. If not, explain why it's not possible. 2.119 Suppose that 40 alu 30 Applying the Concepts-Basic 2.120 Math scores of twelfth graders. According to the National Center for Education Statistics (2013), scores on a mathe- matics assessment test for United States 12th graders have a mean of 153, a 25th percentile of 111, a 75th percentile of 177, and a 90th percentile of 197. Interpret each of these numerical descriptive measures. 2.121 Drivers stopped by police. According to the Bureau of Justice Statistics (Sept. 2013), 79% of all licensed drivers stopped by police are 25 years or older. Give a percentile ranking for the age of 25 years in the dis- tribution of all ages of licensed drivers stopped by police.

Explanation / Answer

Descriptive statistics involves summarizing and organizing the data so they can be easily understood. Descriptive statistics, unlike inferential statistic, seeks to describe the data, but do not attempt to make inferences from the sample to the whole population

all the data values are grouped around a central value 153.

The lowest 25% of the data values form the first quartile—Q1 =111

The next 25% of the data values from the second quartile—Q2

The next 25% of the data values from the third quartile—Q3 =177

the measure of variation: Interquartile range = Q3 - Q1= 177-111=66

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