Hypothesis Testing And Analysis Case Study

1357 words - 5 pages

Hypothesis Testing and AnalysisThe Hypothetical Coalition for Ridgecrest Youth (HCRY) is a private, non-profit organization designed to support and develop agencies, organizations and volunteer groups in youth development through education and training. In order to support the efforts of the HCRY, the organization conducts fundraisers at different times of the year in Ridgecrest, California. The HCRY directors have decided to add an additional fundraiser to their schedule for 2005. In the past, late summer water activity fundraisers have generated significant revenue. The directors want to replicate this success in the spring by holding a fundraiser at the city's public outdoor swimming facility in April 2005.Based on a previous recommendation by Learning Team B, the directors selected Saturday, April 23, 2005 as the primary date for the spring fundraiser. At a follow-up meeting, one of the directors suggested that April 30th might be a better day to hold the fundraiser, since the temperatures would be warmer and more conducive to outdoor events. In order to assist the directors in choosing the best date for the fundraiser, Learning Team B researched ambient temperatures and the historical temperatures for Ridgeway, California on April 23rd and April 30th to analyze suitability and any potential temperature differences between the dates.In order for the fundraiser to attract attendees, the daily temperatures must be warm enough to support water activities. While comfortable temperatures are often a matter of personal taste, several scientific studies identify the range of temperatures required to maximize comfort levels. For normal outdoor activities, one prominent study finds that people prefer temperatures within the accepted room temperature range of 68 to 72 degrees Fahrenheit (Garden, 2004). The same research finds that swimmers who are active out of the water are reasonably comfortable with an ambient air temperature of 75 degrees Fahrenheit. Less active swimmers require an air temperature of at least 80 degrees Fahrenheit (Garden, 2004). The mean historical temperatures on April 23rd and April 30th both exceed 79 degrees Fahrenheit, and previously conducted z tests show that, within a significance value of .01, high temperatures on both dates are expected to be within the acceptable range for a reasonably active outdoor swimming fundraising event. Given the expected suitable temperatures on both dates, Learning Team B moved forward with the comparison of the two dates in question.Experimental DesignThe learning team based the scope of the feasibility study on hypothesis testing. The following hypotheses were established as the criterion for the test:Null hypotheses (H0): Based on historical averages, there is no statistically significant difference in daytime high temperature variance on April 23rd, 2005 and April 30th, 2005.Alternate hypotheses (H1): Based on historical averages, there is a statistically significant difference in daytime...

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