A sales manager for an advertising agency believes there is a relationship between the number of contacts and the amount of the sales. To verify this believe, the following data was collected: 
The 95% prediction interval for a particular person making 30 calls is:
Definitions:
Turkey
A country located at the crossroads of Europe and Asia, known for its rich history, cultural heritage, and strategic geographical location.
Sickle-Cell Anemia
An inherited form of anemia produced by a mutation in the hemoglobin protein that causes the red blood cells to assume a sickle shape.
Northern Europeans
The inhabitants of countries located in the northern part of Europe, often characterized by specific genetic, cultural, and geographical traits.
Advent of Writing
The historical period when human societies began to develop and use writing systems to record information, events, and ideation.
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