A simple random sample of 90 items resulted in a sample mean of 60. The population standard deviation is o = 15. The 95% confidence interval for the population mean is from [Select] to [Select] Assume that the same sample mean was obtained from a sample of 180 items. Now, the 95% confidence interval for the population mean is from [Select] to [Select] What is the effect of a larger sample size on the interval estimate? [Select]

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