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# HW7 - accurate Are these assumptions met here 6 8.46(page...

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Stat 3011 Homework 7 Stat 3011: Homework 7 Due: Tuesday, March 24th Directions: Same directions as always (they are also written on the homework website). Assigned Exercises: 1. 8.1 (page 361) 2. 8.6 (page 361) 3. 8.12 (page 372) HINT: Recall that the standard error of ˆ p is p ˆ p (1 - ˆ p ) /n . 4. 8.14 (page 372) (a) book part a (b) book part b. Use Rweb to construct the 95% conﬁdence interval. (See directions on the next page.) Recall that the answer Rweb gives is slightly diﬀerent than you would get when calculating the interval by hand. (c) Use Rweb to calculate the 98% and 99% conﬁdence intervals. You do not need to interpret these intervals! (d) What do the conﬁdence intervals in parts b and c demonstrate about the relationship between the conﬁdence level of a conﬁdence interval and the width of the conﬁdence interval? 5. 8.22 (page 373) (a) book part a (b) book part b (c) What assumptions must be met in order for the conﬁdence interval in part a to be

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Unformatted text preview: accurate? Are these assumptions met here? 6. 8.46 (page 394) 7. 8.48 (page 394) 1 Stat 3011 Homework 7 Rweb Directions for Problem 4 Step 1. Open Rweb. (Access Rweb through the link on the homepage. If this takes you to a warning screen, clink on the ‘Continue to this website’ link and log in to the U of M system.) Step 2. Enter the following code into the Big text box: prop.test(x=1093, n=1232, conf.level=0.95) prop.test(x=1093, n=1232, conf.level=0.98) prop.test(x=1093, n=1232, conf.level=0.99) NOTE: The ﬁrst line of code will give the 95% conﬁdence interval, the second line of code will give the 98% conﬁdence interval, and the third line of code will give the 99% conﬁdence interval. Step 3. Click the “Submit” button. Step 4. Print out the Rweb results page. 2...
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HW7 - accurate Are these assumptions met here 6 8.46(page...

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