A City-Paid Consumer Advocate Wants to Secure Information About the Mean

question 68

Short Answer

A city-paid consumer advocate wants to secure information about the mean length, $\mu$ ,of coin-separated car wash cycles.A previous study reported the standard deviation of the length of car wash cycles to be 6 minutes.The advocate timed the wash cycle at 81 randomly selected car wash locations and the mean of the sample was 4.8 minutes.The 90 percent confidence interval estimate is 3.70 to 5.90 minutes.Interpret this interval.

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Definitions:

Cortex

The outermost layer of the brain, involved in high-level functions such as consciousness, thought, emotion, reasoning, language, and memory.

Wrinkles

Lines or creases in the skin, often resulting from aging, loss of elasticity, or exposure to sun.

Brain

The complex central organ of the nervous system, enclosed within the skull, functioning as the primary receiver, organizer, and distributor of information for the body.

Myelin

A fatty substance that surrounds and insulates the axons of many neurons, enhancing the speed and efficiency of electrical signal transmission in the nervous system.