and sample standard deviation s = 5.9. i. Construct a 95% confidence interval for the population mean μ. ii. If the confidence level were 99%, would the confidence interval be narrower or wider?
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i. Construct a 95% confidence interval for the population mean μ.
ii. If the confidence level were 99%, would the confidence interval be narrower or wider?
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- If X = 143, o = 29, and n= 35, construct a 95% confidence interval estimate of the population mean, µu. (Round to two decimal places as needed.)Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if theaverage weight was less than advertised. She selected a random sample of 30 cookies andfound the weight of each cookie (in grams). The mean weight was = 11.1921 grams with astandard deviation of sx = 0.0817 grams. Make a 95% confidence interval to estimate the truemean weight of an Oreo. 1. What is the formula for calculating the standard deviation of the sampling distribution of x? 2.What condition must be met to use this formula? Has it been met?A sample of size 25 was taken from a very large population. Sample statistics, x¯ and s, were used to find that the 95% confidence interval was (138.616, 163.384). x¯= s=
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