Two Independent Samples of Sizes 50 and 50 Are Randomly $\mu _ { 1 } - \mu _ { 2 }$

question 4

Multiple Choice

Two independent samples of sizes 50 and 50 are randomly selected from two populations to test the difference between the population means, $\mu _ { 1 } - \mu _ { 2 }$ . The sampling distribution of the sample mean difference $\bar { x } _ { 1 } - \bar { x } _ { 2 }$ is:

• A) normally distributed.
• B) approximately normal.
• C) t-distributed with 98 degrees of freedom.
• D) chi-squared distributed with 99 degrees of freedom.

Understand the whole-object assumption and its implications for language development.

Describe the cognitive abilities and limitations of preoperational children.

Understand the various factors influencing cognitive development in early childhood.

Identify and explain common language errors made by children in early childhood.

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