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Suppose duration of human pregnancies are somewhat skewed with a mean of 262 days and a standard deviation of 15 days. Suppose a certain obstetrician is currently providing prenatal care to 40 pregnant women. Let bar-y represent the mean length of their pregnancies.
Is the distribution of sample means normal or not normal?
What is the value of sigma bar-y? (carry two decimals)
Suppose the obstetrician provided prenatal care to 45 pregnant women instead. How would this change the mean of the dirstibution of sample means? (smaller, larger or no change)
How would this change the standard deviation of sample means?
For each of the given population would the score of X=50 be considered central score (near middle of distribution) or extreme score (far out in the tail of the distribution )?
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Identify a business situation where you might want to make an estimate. For example, you might want to estimate the mean dollar amount spent by customers at a retail store.
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Compute the 95% confidence interval for the population proportion of registered voters who favor the slow growth initiative.
John conducted his study to measure self-esteem among victims of domestic violence before and after they complete an 8-week program for abuse victims with 10 individuals.
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