Mathematics, 02.07.2019 02:20 melissa578
If the true population proportion of children with an oral cleft whose mothers smoked is as low as 0.25, you want to risk only a 10% chance of failing to reject the null hypothesis. if you are conducting a two-sided test at the 0.01 level of significance, how large a sample would be required?
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Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.
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