Let’s Dance Stephanie Webber, a dance instructor at a local college, is always l
ID: 3526457 • Letter: L
Question
Let’s Dance
Stephanie Webber, a dance instructor at a local college, is always looking for new ways to help her dance students improve their techniques. One way she thought to do this was to show her students a dancing video that she strongly believed would help them improve their dance ability. The video showed dance performances on the popular TV show “Dancing with the Stars.”
During the first week of a new dance schedule, she asked students who were interested in helping her with a project to join her that weekend at the studio. Ten of her students were able and willing to join her that weekend.
Without telling them what she was doing, she measured each of the participant’s dancing ability using a test in which she videotaped them dancing alone while holding a broom. While sounding a bit funny, the test has been validated in a number of studies using blind scoring. The scorer uses an objectively designed coding scheme to code the dancer’s movements using slow motion and pausing of the videotapes.
Prior to this study, Webber was trained to use the coding scheme. She coded each dancer’s videotapes as they performed the “broom test.”
Ten students completed the broom test and then watched the “Dancing with the Stars” video. According to post-experimenter questionnaires, they were all unaware that the video was supposed to help them improve their dancing ability. After they watched the video, they took the broom test again while being videotaped. Webber collected the tapes and coded them herself.
The dance instructor found that her students’ dancing ability was significantly better after they watched the video than it had been before. In order to be certain that the video was truly effective, she repeated the study with another ten dance students and found the same thing. As a result, she felt confident concluding that watching the dancing video will indeed improve the dancing skills of students in her classes.
Which of the following are true (there may be more than 1):
- Poor or missing comparison group
- No Random assignment
- DV could be more sensitive, accurate, or precise
- DV is not scored objectively
- DV is not valid
- subject/participant bias
- mortality or attrition
- small sample size
- poor sample selection
- experimenter bias
- premature generalization of results
- confuse correlation with causation
Explanation / Answer
In this case, there is a poor or missing comparison group. The DV also is not scored objectively, as only the dance instructor is scoring it. Other problems with the study is small sample size, poor sample selection and experimenter bias.
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