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In order to construct a 95% confidence interval for the population mean when the population standard deviation is unknown and the sample size is 15, you should use the t-value indicated as:
Primary Circular Reaction
A developmental phase identified by Jean Piaget, involving repetitive actions centered on the infant's own body, typically seen as a form of early learning.
Refusing
The act of denying or rejecting a proposal, request, or command.
Laughing
An involuntary response to certain external or internal stimuli, often associated with amusement, joy, or relief.
Internalization of Schemes
The process by which children absorb and integrate new information and experiences into their existing cognitive structures or schemas.
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