# A student's grade on an exam

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1) A student's grade on an exam was transformed to a z-value which is negative. therefore, we know that he or she scored:

Choices: higher 16% of class, higher than 45% of class, above the first quartile, below the mean, lower than 16% of the class.

I think is is the lower than 16% of the class.

2) Which of one of the following sampling examples would generally lead to the least reliable statistical inferences about the population from which the sample has been selected?

A random sample selected without replacement

A random sample selected with replacement

a voluntary response sample

a systematic sample.

https://brainmass.com/statistics/dispersion-and-spread-of-data/students-grade-exam-153521

#### Solution Preview

1) it is "below the mean" - if a Z score is negative it only tells ...

#### Solution Summary

The expert examines the student's grades on an exam.

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