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A behavioral psychologist wanted to know if making a public commitment to lose weight will make...

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Statistics

A behavioral psychologist wanted to know if making a publiccommitment to lose weight will make a difference in how much weightis actually lost. He obtained 14 volunteers who wanted to loseweight and randomly assigned them to one of two groups. The“commitment” group met together and each participant stood andannounced an intent to lose weight and signed a pledge to adhere tothe diet and exercise regimen. The “control” was placed on the samediet and exercise regimen, but did not stand to announce theirintent to lose weight and did not sign a pledge to adhere to theregimen. The commitment group participants lost 13, 11, 13, 12, 10,9,and 8 pounds; the control group participants lost 10, 6, 7, 5, 9,6, and 8 pounds. Did making a commitment to adhere to the diet andexercise regimen make a significant difference in weight loss?

  • What is the IV? How many levels?
  • What is the DV?
  • Construct a frequency distribution with that data above foreach group
  • What are the means of the 2 groups?
  • What is the df?
  • What type of t test needs to be conducted?
  • What is the calculated t statistic?
  • Is this a one tail or 2 tail test?
  • Are the findings significant at alpha .05? Explain what thismeans.

Answer & Explanation Solved by verified expert
3.7 Ratings (705 Votes)
Ho 1 2 0 Ha 12 0 two tail test Level of Significance 005 Sample 1 sample 1 mean of sample 1 x1 1086    See Answer
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