h penalty. If a random sample of n = 1234 ns yielded y = 864 who favored the death find an approximate 95% confidence interval
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- For a population of normally distributed scores, μ = 155 and σ = 12, approximately what would be the 95% confidence interval of the population mean based upon a random sample of 16 scores with a mean of 140?A 30 month study is conducted to determine the difference in rates of accidents per month between two departments in an assembly plant. If a sample of 12 from the first department averaged 12.3 accidents per month with a standard deviation of 3.5, and a sample of 9 from the second department averaged 7.6 accidents per month with standard deviation of 3.4, find: The t-value for a 95% confidence interval is: A. 2.09302 B. 1.724718 C. 2.08596 D. 1.729133 E. none of the preceding4.) A simple random sample of size n is drawn from a population that is normally distributed. Using the data, it was found to be: x-bar = 108, and s = 10. Construct a 95% confidence interval about μ if the sample size is 25. Construct a 95% confidence interval about μ if the sample size is 10. Compare your results from Parts (a) and (b). How does decreasing the sample size affect the margin of error? Construct a 90% confidence interval about μ if the sample size is 25.
- 6. Suppose the population standard deviation for IQ scores is 15 points. What sample size would be required to ensure that the width of your 95% confidence interval for the mean IQ score would have a width of no more than 4 points?9.13) The breaking strength of threads has a standard deviation of 18 grams. How many measures of breaking strength should be used in the next experiment if the estimate of the mean breaking strength is to be within 4 grams of the true mean breaking strength, with a confidence coefficient of 0.90?Suppose a researcher found that M= 30.00 and SEM= 3.00. What are the limits of the 68% confidence interval fofr the mean?
