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For each of the fifty states if you look at the state average income and the percentage of people in that state who are foreign-born immigrants, you will see a positive correlation. Does this mean immigrants tend to earn more than other people? Or does it mean immigrants improve a state's economy? If not, what could explain the correlation?
A recent article suggested that if you earn $25,000 a year today and the inflation rate continues at 3 percent per year, you'll need to make $33,598 in 10 years to have the same buying power. You would need to make $44,771 if the inflation rate ju..
Suppose that about 48% of all infants are girls. The maternity ward at a large hospital handles 1000 deliveries per year. A smaller hospital in the same city records about 50 deliveries per year. At which hospital is it more likely that between 46..
What is the probability of this project being completed earlier than 19 days?
Write down the probability of that the median of the sample or average medians is greater or more than 320 minutes?
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
A. What is the 90% confidence interval for the daily sales at all restaurants. B. What is the probability that the average sales are really $32,000 or more per day? Assume that the population average is $30,000 per day and the std. Deviation is $2..
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
Why do we have so many several measures of central tendency? Are all really essential or do they essentially give same information?
When studying simultaneous responses to two categorical questions, we should set up a a) contingency table. b) frequency distribution.
The sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
In 1,000 samples, assuming that H 0 is true, how many times would you expect to commit Type I error if:
The manager requires the estimate to be within 1.0 minutes of the population value. What sample size is needed?
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