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One article describes measurements of ammonium concentrations (in mg/L) at a large number of wells in the state of Iowa. These included 349 alluvial wells and 143 quaternary wells. The concentrations at the alluvial wells averaged 0.27 with a standard deviation of 0.40, and those at the quaternary wells averaged 1.62 with a standard deviation of 1.70. Find a 95% confidence interval for the difference in mean concentrations between alluvial and quaternary wells
Calculate the margin of error that would be used to determine a 99% confidence interval for the mean pulse rate of all women.
Find the probability that the age of a randomly selected CEO will be between 56-57 y/o. (round to 4th decimal) The probability a randomly selected CEO will be between 56-57 y/o is?
the data set toxemia contains information for a sample of 100 infants born in two hospitals in boston. indicators of a
As sample size increases, the standard error of M _______________ .
Assuming that an IP packet has a maximum 900 byte payload, determine the following. What is the probability that a file transfer requires more than 10 packets? repeat for 100 or more?
Suppose that a random sample of 200 adults found that 110 thought there is too much violence on television. Is this enough evidence to reject the claim? What do we want to know?
A consumer purchases 12 frozen chickens. What is the probability that the consumer will have more than 6 contaminated chickens?
a lottery commission offers four different lottery games to play three-number four-number five-number and five-number
The mean of a sample is 22.5. The mean of 1000 bootstrapped samples is 22.491. The bias of the bootstrap mean is
Determine the 95% confidence interval for the population mean, based on the sample mean.
Their mean monthly sales were $10,000 with a standard deviation of $1000. Construct a 95% confidence interval for the population mean.
Evidence of statistical interaction or effect modification. What is the odds ratio for diabetes in a man aged 65 compared with a woman aged 60 (both have the same waist circumference)?
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