Math119Quiz4S11

Math119Quiz4S11 - Math 119 Name: _ QUIZ 4 (CHAPTER 7) MATH...

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Math 119 Name: ________________________ QUIZ 4 (CHAPTER 7) MATH 119 – SPRING 2011 – KUNIYUKI 105 POINTS TOTAL, BUT 100 POINTS = 100% Show all work, simplify as appropriate, and use “good form and procedure” (as in class). Box in your final answers! No notes or books allowed. A scientific calculator is allowed. You may detach the attached tables and write on them. Turn in the tables with your test, but any work written on them will not be graded. Do not leave “+”, “ ± ”, or ± ” in your final confidence intervals; write the lower limit and the upper limit of each interval, as we have done in class. Avoid rounding until you write the simplified margin of error or your final answer. Then, round to the same number of decimal places as the given value of x , s , or s 2 . If you want to round in the middle of a problem, round to at least five significant digits. (We're assuming that the population of interest is much larger than the sample, so there is no need to use a finite population correction factor. Do not use continuity corrections.) 1) We will conduct a survey to estimate the average number of gifts purchased by American families the day after Thanksgiving. We want to have 92% confidence that the resulting sample mean will be within 0.3 gifts of the true
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Math119Quiz4S11 - Math 119 Name: _ QUIZ 4 (CHAPTER 7) MATH...

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