A psychologist has developed a standardized test for measuring the vocabulary skills of 4-year-old children. The scores on the test form a normal distribution with μ = 72 and σ = 12. A researcher would like to use this test to investigate the idea that children who grow up with no siblings develop vocabulary skills at a different rate than children in large families. A sample of n = 25 children is obtained, and the mean test score for this sample is 66. On the basis of this sample, can the researcher conclude that vocabulary skills for children with no siblings are significantly different from those of the general population? Test at the .01 level of significance.
In this assignment students will demonstrate their understanding of the distribution of means doing all steps of hypothesis testing.
For each problem students will write out all steps of hypothesis testing:
After completing of the steps of hypothesis tests, write out your results in APA format and in easy-to-understand language
3. A psychologist has developed a standardized test for measuring the vocabulary skills of 4-year-old children. The scores on the test form a
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