Recall from section 44 that we can assume that the

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Unformatted text preview: ed. (Recall from section 4.4 that we can assume that the sampling distribution of x is normal for values of n greater than 30.) Examples: 1. Suppose your class is investigating the weights of Snickers 1-ounce fun-size candy bars to see if customers are getting full value for their money. Assume that the weights are normally distributed with standard deviation σ =.005 ounces. Several candy bars are randomly selected and weighed with sensitive balances borrowed from the physics lab. The weights are: .95 1.02 .98 .97 1.05 1.01 .98 1.00 We want to determine a 90% confidence interval for the true mean, µ . a. What is the sample mean? b. Determine z * . c. Determine the 90% confidence interval. (Show your work) d. Write a sentence that explains the significance of the confidence interval. 2. A SRS of 16 seniors from HISD had a mean SAT-math score of 500 and a standard deviation of 100. We know that the population of SAT-math scores for seniors in the district is approximately normally distri...
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