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STAT 113 - Quiz - Lesson 21 (Extra Credit) - Form A - Fall 2009

# STAT 113 - Quiz - Lesson 21 (Extra Credit) - Form A - Fall 2009

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STAT 113 Quiz (Lesson 21) Name: _________________________ 1. Fill in the blank: To test whether the means of two ( ) groups are different, we can use a two-sample t procedure. 2. Determine that the statement is true (T) or false (F). To use a two-sample t procedure, we must assume that each of the underlying populations have a normal distribution. Nevertheless, for larger samples, this assumption is not required. Answer: ________ 3. When you want to construct a confidence interval to estimate the difference between the means of two groups, which procedure would you use? (Circle one) z-interval for µ t-interval for µ 2-sample t-interval for µ1 – µ2 4. To test whether there is a difference in mean sodium content between beef and poultry hot dogs, find the p-value using the given information below. Answer: ( ) Form A

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STAT 113 Quiz (Lesson 21) 5. Using the given information below, select the interpretation: A. There is statistically significant evidence that there is no difference in the mean sodium
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Unformatted text preview: content between beef and poultry hot dogs. B. There is not statistically significant evidence that there is no difference in the mean sodium content between beef and poultry hot dogs. C. There is not statistically significant evidence that there is a difference in the mean sodium content between beef and poultry hot dogs. D. There is statistically significant evidence that there is a difference in the mean sodium content between beef and poultry hot dogs. 2-Sample t-Test of µ1-µ2 No Selector Individual Alpha Level 0.05 Ho: µ1-µ2 = 0 Ha: µ1-µ2 € 0 Hide Results Bf sodium - Plt sodium : Test Ho: µ(Bf sodium)-µ(Plt sodium) = 0 vs Ha: µ(Bf sodium)-µ(Plt sodium) € 0 Difference Between Means = -57.85 t-Statistic = -1.88 w/34 df ( ? ) at Alpha = 0.05 p = 0.0685 Form A STAT 113 Quiz (Lesson 21) Form A...
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STAT 113 - Quiz - Lesson 21 (Extra Credit) - Form A - Fall 2009

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