Evaluate the difference in the mean ratings

Reference no: EM137705

1. Females in a certain class rated their intelligence with a mean of 6.5. The males in the same class rated their intelligence with a mean of 7.25. The difference in the mean ratings (male - female) was

A. -0.75 points.
B. 0.75 points.
C. 13.75 points.

2. Females in a certain class rated their intelligence with a mean of 6.5 with standard deviation 1.12. The males in the same class rated their intelligence with a mean of 7.25, with standard deviation 1.50. The standard deviation of the difference in the ratings (male - female) was

A. 0.38.
B. 3.50.
C. 1.87.
29. Most people think babies are equally likely to come as either a boy or a girl. This is not true. Actually, about 51.3% of all babies are boys. If a family has two children (not twins), what is the chance both children are boys?

A. 25%
B. 102.6%
C. 26.3%

3. Most people think babies are equally likely to come as either a boy or a girl. This is not true. Actually, about 51.3% of all babies are boys. If a family has two children (not twins), what is the chance they have one boy and one girl?

A. 0.25
B. 0.50
C. 0.24

Reference no: EM137705

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