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Unformatted text preview: Average of the Sample = Standard Deviation = ( ) Confidence Interval =
Where: Xbar = the average for the sample ±( ) Z = the z score as determined by the confidence level - 90% = 1.65 - 95% = 1.96 - 99% = 2.58 ( ) = the estimated standard error (i.e. the estimated standard deviation of the sampling distribution). A study of how much television Americans watch was conducted on a sample of 1000 people. According to the results of the study, the average amount of television watched was 6.2 hours per day (with a standard deviation of .07). Assuming that we wanted to be 95% confident that we are estimating the correct value, what range of values should we report as the average amount of television watched by Americans per day? Xbar = 6.2, Standard Deviation = .07, N = 1000, Z = 1.96 Confidence Interval =
Step 1: c.i. = 6.2 ± . Step 2: c.i. = 6.2± . Step 3: c.i. = 6.2± . Step 4: c.i. = 6.2± . Step 5: c.i. = 6.2±. Step 6: c.i. = (6.2 - .04) to (6.2 + .04) ( ( ( (.
. . . ±( ) ) ) . ) ) Step 7: c.i. = 6.16 to 6.24 hours watching TV per day. ...
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This note was uploaded on 10/16/2010 for the course SOC 4 taught by Professor Rick during the Spring '08 term at UC Riverside.
- Spring '08