At What Age Do Babies Learn to Crawl? Does It

question 20

Multiple Choice

At what age do babies learn to crawl? Does it take longer to learn in the winter when babies are often bundled in clothes that restrict their movement? Data were collected from parents who brought their babies into the University of Denver Infant Study Center to participate in one of a number of experiments between 1988 and 1991.Parents reported the birth month and the age at which their child was first able to creep or crawl a distance of 4 feet within 1 minute.The resulting data were grouped by month of birth: January,May,and September. The data are to be analyzed with the Kruskal-Wallis test.Under the null hypothesis,compute the approximate distribution of H.At the 5% significance level,would we reject the null hypothesis?

• A)Yes
• B)No
• C)This cannot be determined from the information given.

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Definitions:

Behaviorally Anchored Rating Scale

A method used for appraising an employee's performance, featuring specific examples of behavior anchored to numerical ratings.

Behavioral Observation Scale

A method used in performance appraisal that involves rating the frequency of observed behavior.

Rating Scale

A method for assigning a value to a person's performance or characteristics, often in the form of a numbered or descriptive scale.

Alternation Ranking

A method of evaluating employees where individuals are compared and ranked alternately in terms of best and worst performance.