The Sample Variance $s ^ { 2 }$ Is an Unbiased Estimator of the Population Variance

question 29

Short Answer

The sample variance $s ^ { 2 }$ is an unbiased estimator of the population variance $\sigma ^ { 2 }$ when the denominator of $s ^ { 2 }$ is: $\begin{array}{|l|l|}\hline\text { A. } & n . \\\hline \text { B. } & n-1 \\\hline \text { C. } & \sqrt{n } \\\hline \text { D. } & n+1 \\\hline\end{array}$

Comprehend the relationship between development stages and cognitive competencies in early childhood.

Recognize the recommended sleep duration for young children and its importance.

Identify factors influencing food security and its relation to child health.

Describe the influence of brain development and cultural activities on early childhood development.

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Definitions:

Irrational Beliefs

Faulty thinking patterns that are unrealistic or illogical and often cause emotional distress or unhealthy behaviors.

Rational Beliefs

Beliefs that are logically consistent and based on factual evidence, often emphasized in cognitive-behavioral therapies to counter irrational thoughts.

Activating Events

Situations or events that trigger emotional or behavioral responses, a key concept in cognitive-behavioral therapy.

Cognitive-behavior Therapy

A form of psychological treatment that helps individuals understand the thoughts and feelings that influence behaviors, aiming to teach coping strategies for dealing with different problems.