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For the population of infants subjected to fetal surgery for congenital anomalies, the distribution of gestational ages at birth is approximately normal with unknown mean µ and standard deviation sigma. A random sample of 14 such infants has mean gestational age x-bar = 29.6 weeks and a standard deviation s = 3.6 weeks. . (note: sigma is unknown, therefore t distribution)
Construct a 95% CI for the true population mean µ.
What is the length of this interval
How large a sample would be required for the 95% CI to have length 3 weeks? Assume that the population standard deviation sigma is known and that sigma = 3.6 weeks.
How large a sample would be needed for the 95% CI to have length 2 weeks?
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Out of the 109 males, 42% preferred Pepsi and out of the 53 females, 40% preferred Pepsi. Pepsi wanted to test to determine if the males preferred Pepsi more than females.
If you draw a ball, record the color then draw a second without replacing the first ball, what is the probability of choosing two green balls?
according to a 2003 national household survey on drug use and health 263 out of 1546 randomly selected americans
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