Recent research has demonstrated that music-based physical training for elderly people can improve balance, walking efficiency, and reduce the risk of falls (Trombetti et al,. 2011). As part of the training, participants walked in time to music and responded to changes in the music’s rhythm during a one-hour per week exercise program. After six months, participants m the training group increased their walking speed and their stride length compared to individuals in the control group. The following data are similar to the results obtained in the study.
Do the results indicate a significant difference in the stride length for the two groups? Use a two-tailed test with α =.05
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Chapter 10 Solutions
Essentials of Statistics for the Behavioral Sciences
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- McAllister et al. (2012) compared varsity football and hockey players with varsity athletes from non-contact sports to determine whether exposure to head impacts during one season have an effect on cognitive performance. In the study, tests of new learning performance were significantly poorer for the contact sport athletes compared to the non-contact sport athletes. Cognitive Performance Contact Athletes Non-Contact Athletes n1 = 8 n2 = 8 M1 = 6 M2 = 9 s2 = 8 s2 = 6.23 Are the test scores significantly lower for the contact sport athletes than for the non-contact athletes? Conduct the appropriate hypothesis test using α = .05 and state your conclusion in terms of this problem. Make sure to use APA style conclusions (as shown in lecture videos).arrow_forwardIn a classic study, Shrauger (1972) examined the effect of an audience on performance for two groups of participants: high self-esteem and low self-esteem individuals. The participants in the study were given a problem-solving task with half of the individuals in each group working alone and a half working with an audience. Performance on the problem-solving task was measured for each individual. The results showed that the presence of an audience had little effect on high self-esteem participants but significantly lowered the performance for the low self-esteem participants. a. How many factors does this study have? What are they? b. Describe this study using the notation system that indicates factors and numbers of levels of each factor.arrow_forwardThe study “Evaluation of Prescribed Burning in Relation to Available Deer Browse” was undertaken at the Virginia Polytechnic Institute and State University in 1964 to determine if fire can be used as a viable management tool to increase the amount of forage available to deer during the crucial months in late winter and spring. Calcium is a required element for plants and animals. The amount taken up and stored in the plant is closely correlated to the amount present in the soil. It was hypothesized that fire may change the calcium levels present in the soil and thus affect the amount available to the deer. A large tract of land in the Fishburn Forest was selected for a prescribed burn. Soil samples were taken from 12 plots of equal area just prior to the burn on May 20, 1964, and analyzed for calcium. On July 16, 1964, postburn calcium levels were analyzed from the same plots. These values, in kilograms per plot, are presented in the following table. Do these data support the…arrow_forward
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