Mrs. Roger's 3rd grade class was given the Ledd IQ test. The Ledd has a SD of 10. A recent study noted that the Ledd is internally consistent with a coefficient alpha of .91. Calculate a 95% confidence interval for the following children in Mrs.Roger's class:

Sarah, 86
Neil, 107
Becca, 132
Joey, 79

Would you be confident in saying that...

Becca is more intelligent than: Neil? Sarah? Joey?
Neil is more intelligent than : Sarah? Joey?
Sarah is more intelligent than Joey?

Answer with a Yes or No.