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Male children. While it is often assumed that the probabilities of having a boy or a girl are the same, the actual probability of having a boy is slightly higher at 0.51. Suppose a couple plans to have 3 kids.
(a) Use the binomial model to calculate the probability that two of them will be boys.
(b) Write out all possible orderings of 3 children, 2 of whom are boys. Use these scenarios to calculate the same probability from part (a) but using the addition rule for disjoint outcomes. Confirm that your answers from parts (a) and (b) match.
(c) If we wanted to calculate the probability that a couple who plans to have 8 kids will have 3 boys, briefly describe why the approach from part (b) would be more tedious than the approach from part (a).
suppose a geyser has a mean time between eruptions of 94 minutes. let the interval of time between the eruptions be
Analyze the data using linear contrasts to make the following comparisons:
An article in the Journal of Monetary Economics assesses the relationship between percentage growth in wealth over a decade and a half of savings for baby.
When Will Adolescent Males Report Risky Behavior? It is particularly difficult to measure information on behavior that is sensitive, risky, or illegal.
A 99% confidence interval for the proportion () of all Lewisburg residents whose annual income exceeds $80,000 extends from 0.10 to 0.18. what is the correct statistical decision in this case?
assuming that ssy is constant which of the following correlations would have the smallest ssresidual?please explain
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
Find the mean length. Find the median length. Find the range of the lengths. Find the mean deviation of the lengths. Finds the standard deviation of the lengths
Once R is selected, the sum is compounded instantaneously for a year so that X= 50000 e^R dollars is the amount at the end of that year. Find the distribution function and the p.d.f. of X.
the probability that it gets by the first inspector is 0.1. Of those that get past the first inspector, the second inspector will miss 5 out of 10. What fraction of the defective items gets by both inspectors?
When n = 250, determine the probability that proportion of couples in sample who are racially or ethnically mixed will be greater than 0.07?
Many times researchers preselect the value of alpha of .01 or .001. What are the factors that allow selection of either of those levels of significance?
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