A Group of Statistics Students Decided to Conduct a Survey

question 75

Multiple Choice

A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week. Based on a simple random sample, they surveyed 144 students. The statistics showed that students studied an average of 20 hours per week with a standard deviation of 10 hours. What is the probability that average student study time is between 18 and 22 hours?

• A) 0.9640
• B) 0.0160
• C) 0.0360
• D) 0.9836

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Definitions:

Sodium Ion

A positively charged ion (Na+) essential for various physiological functions, including nerve impulse transmission and fluid balance in the body.

Calcium Ions

Positively charged calcium atoms (Ca2+) that play vital roles in various biological processes, including muscle contraction, neurotransmission, and blood clotting.

Unequal Ion Concentration

Refers to a difference in the concentration of ions across a membrane, leading to potential differences and driving forces for ion movement.

Sodium-chloride Pump

A mechanism, particularly in the kidney cells, that helps in the reabsorption or excretion of sodium and chloride ions.