Question: The data in T6-8.dat were collected to test two psychological models of numerical cognition.

Does the processing of numbers depend on the way the numbers are presented (words, Arabic

digits)? Thirty-two subjects were required to make a series of quick numerical judgments

about two numbers presented as either two number words ("two", "four") or two single

Arabic digits ("2","4"). The subjects were asked to respond "same" if the two numbers had

the same numerical parity (both even or both odd) and "different" if the two numbers had

a different parity (one even, one odd). Half of the subjects were assigned a block of Arabic

digit trials, followed by a block of number word trials, and half the subjects received the

block of trials in the reverse order. Within each block, the order of "same" and "different"

parity trials was randomized for each subject. For each of the four combinations of parity

and format, the median reaction times for correct responses were recorded for each subject.

X1=median reaction time for word format - different parity combination

X2=median reaction time for word format - same parity combination

X3=median reaction time for Arabic format - different parity combination

X4=median reaction time for Arabic format - same parity combination

1. Test for treatment effects using a repeated measures design. Set alpha = 0:05.
2. Construct 95% (simultaneous) confidence intervals for the contrasts representing the

number format effect, the parity type effect, and the interaction effect. Interpret the

resulting intervals.

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