A Group of Statistics Students Decided to Conduct a Survey

question 69

Multiple Choice

A group of statistics students decided to conduct a survey at their university to estimate the average (mean) amount of time students spent studying per week. They sampled 554 students and found a mean of 22.3 hours per week. Assuming a population standard deviation of six hours,what is the 95% level of confidence?

• A)[21.80,22.80]
• B)[16.3,28.3]
• C)[21.64,22.96]
• D)[20.22,22.0]

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Definitions:

Sample Means

The average values obtained from multiple subsets of a population.

Pooled Standard Deviation

A method used to estimate the standard deviation of several different populations when the mean of each population may differ but the true standard deviation of each population is assumed to be the same.

Lower Control Limit

The lowest value on a control chart, indicating the threshold below which a process output is considered out of control.

Sample Means

Calculated averages from different samples within a population, used in statistical analysis for comparisons.