At a Particular Academically Challenging High School,the Average GPA of a High

question 9

Multiple Choice

At a particular academically challenging high school,the average GPA of a high school senior is known to be normally distributed.After a sample of 20 seniors is taken,the average GPA is found to be 2.71 and the variance is determined to be 0.25.Find a 90% confidence interval for the population mean GPA.

• A)[2.5167,2.9033]
• B)[2.5261,2.3939]
• C)[2.5615,2.8585]
• D)[2.6358,2.7842]

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Definitions:

Developmental Stage

A phase of life characterized by specific physical, psychological, or emotional features that individuals typically pass through as they age.

Middle Adulthood

A stage of life typically ranging from around 40 to 65 years old, characterized by stability, maturity, and increased focus on personal and professional achievements.

Older Adulthood

A stage of life generally considered to begin at the age of 65, characterized by retirement, transitioning lifestyles, and increased focus on health maintenance.

Adolescence

The transitional stage of physical and psychological development that occurs between childhood and adulthood.