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Dowel Balancing

Dowel Balancing. Summer 2006. There were three independent variables. The hand in which the dowel was placed (left or right) The verbal task (no talking, saying the alphabet, or saying the alphabet backwards) Gender (a quasi experimental variable) (men or women).

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Dowel Balancing

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  1. Dowel Balancing Summer 2006

  2. There were three independent variables • The hand in which the dowel was placed (left or right) • The verbal task (no talking, saying the alphabet, or saying the alphabet backwards) • Gender (a quasi experimental variable) (men or women)

  3. Was there a main effect of gender? • Gender Mean Std. Error • Women 4.169 .915 • Men 8.635 1.247 • It appears that men hand longer balance times, but was it significant? Check the Sig column in the next slide, if that value is less than .05, the result is reliable and you have a reliable main effect.

  4. Source Sum of df Mean F Sig Squares Square. • Gender 544.388 1 544.388 8.332 .010 • Error 1176.114 18 65.340 • Because the Sig (p value) is less than .05 we found that men did in fact have longer balance times than women.

  5. Was balance time longer in the right than the left hand? • Handplacement Mean Std. Error • Left 7.205 .864 • Right 5.599 .752 • It appears that balance times were longer in the right than in the left hand. But was this reliable? The next slide indicates the probability that the results were reliable.

  6. Hand Placement – main effect • Source Sum of df Mean F Sig Squares Square. Hand 70.423 1 70.423 11.151 .004 Error 113.678 18 6.315 Because the sig level is less than .05 we can say that balance times were longer in the left hand

  7. Did Verbal Task Influence Balance time? • Verbalt Mean Std. Error • No talking 4.679 .505 • Alphabet 10.1741 .445 • Backward 4.353 .496 • It appears that balance times were longest when saying the alphabet forwards, but is it reliable?

  8. Source Sum of df Mean F Sig Squares Square. • Verbal • Task 778.862 23 89.431 26.970 .000 • Error 519.822 36 14.440 • Yes, balance times were long in the alphabet forwards condition

  9. Gender by hand placement interaction • Genderhandpla MeanStd. Error • Women Left 4.862 1.022 • Right 3.477 .890 • Men Left 9.549 1.393 • Right 7.721 1.213 • It appears that there was more of a difference between left and right hand for men than for women

  10. Source Sum of df Mean F Sig Squares Square. • hand * • gender 1.339 1 1.339 .212 .651 • Error 113.678 18 6.315 • Because the sig is greater than .05, this interaction was not reliable

  11. The gender by verbal task interaction • Gender verbalt Mean Std. Error • Women Notalk 2.852 .598 • Alpha 6.588 1.709 • Back 3.068 .586 • Men Notalk 6.505 .815 • Alpha 3.761 2.330 • Back 5.639 .799 • Looks like men had short balance times when saying the alphabet

  12. Source Sum of df Mean F Sig Squares Square. • Verbaltask * • Gender 105.386 2 52.693 3.649 .036 • Error 519.822 36 14.440 • Yes, men were more influenced by verbal task than women

  13. Hand placement by verbal task • Hand Verbal Mean Std. Error • Left Notalk 3.774 .317 • Alpha 3.896 1.930 • Back 3.946 .470 • Right Notalk 5.583 .753 • Alpha 6.453 1.214 • Back 4.761 .581

  14. Did handplacement interact with verbal task? • Source Sum of df Mean F Sig Squares Square. handplacement * Verbaltask 469.512 22 34.756 28.684 .000 Error 294.633 36 8.184

  15. Did men have a problem balancing in the right hand while saying the alphabet backwards? • Gender handpla verbalt Mean Std. Error • Women Left Notalk 2.781 .375 • Alpha 9.067 2.283 Back 2.737 .556 • Right Notalk 2.924 .891 • Alpha 4.108 1.436 • Back 3.398 .688 • Men Left Notalk 4.767 .512 • Alpha 8.724 3.112 • Back 5.154 .757 • Right Notalk 8.243 1.215 • Alpha 8.797 1.957 • Back 6.123 .938

  16. Results from the three way interaction • Source Sum of df Mean F Sig Squares Square. • handplacement * verbaltask * • gender 80.307 2 40.153 4.906 .013 • Error 294.633 36 8.184 • Yes, as predicted, men are more lateralized than women

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