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Homework 5 - Speech or Presentation Example

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The Daytona Beach Tourism Commission believes that the average amount of money spent increased during the most recent spring break. They surveyed…
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Homework 5
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Download file to see previous pages 2) Historically, the average amount of time to assemble an electronic component on a production line has been 14 minutes. The supervisor of this production line is interested in determining whether this is no longer true. Assume that assembly time is normally distributed with a known population standard deviation of 3.4 minutes. The supervisor times the assembly of 25 randomly chosen components, and finds that the average time to assemble is 12.6 minutes. Is there sufficient evidence to suggest that the population mean assembly time is not 14 minutes at the 1% level of significance? What is the p-value?
3) The manufacturer of a new chewing gum asserts that at least 80% of dentists prefer their type of gum. An independent consumer research firm decides to test their claim. The findings of a sample of 200 dentists indicate that 76% of respondents actually prefer the manufacturers gum. At the 5% level, is there sufficient evidence to suggest that the population proportion of dentists who prefer the manufacturers gum is less than 80%? What is the p-value?
4) A college professor is interested in determining the relationship between the number of hours a student sleeps prior to an exam and a students exam grade. The joint distribution is assumed bivariate normal. The professor draws a random sample of four students and records each students exam grade and hours of sleep preceding the exam. These data are found in the table below.
The professor runs a simple regression, but has misplaced her regression output. Recognizing that Exam Grade is the dependent variable and Hours of Sleep is the sole independent variable, she asks you to perform the ...Download file to see next pagesRead More
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