elem. stat. week 5 6.1.25

# elem. stat. week 5 6.1.25 - Q as W W Assignment Week 5...

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Unformatted text preview: Q, / . as W W. Assignment: Week 5 Exercises Date: 9/25/11 Course: Math 201 Fall B10 Time: 12:49 PM Book: Larson: Elementary Statistics: Picturing the World, 5e Use the conﬁdence interval to ﬁnd the estimated margin of error. Then ﬁnd the sample mean. A biologist reports a conﬁdence interval of (2.5,3.9) when estimating the mean height (in centimeters) of a sample of seedlings. The conﬁdence interval is E i E Where 3; is the sample mean and E is the margin of error. The margin of error is equal to half the Width of the conﬁdence interval. Divide the Width of the conﬁdence interval by 2 to ﬁnd the margin of error. 3.9 —2.5 _ __2 , Therefore, the margin of error is 0.7. The sample mean )2 is the middle of the conﬁdence interval. To ﬁnd the sample mean, either add the margin of error to the left endpoint or subtract the margin of error from the right endpoint. In this problem, add the margin of error to the left endpoint. 2.5 + 0.7 = 3.2 Therefore, the sample mean is 3.2. Page I ...
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