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At a baby shower we were discusing baby statistcs. One women told us she had read a report that for every 100 babies born there were 6 more boys than girls. If we were to randomly pick a child from a representative group, what is the probabilety of picking a girl?
What is the null hypothesis? What is your decision if a = 0.01?
The life corn delight popcorn maker is normally distributed with them mean of 20 months and a standard deviation of two months. The manufacturer will replace on the life popper if it breaks during the guarantee period.
He argues that the regression effect says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
Test the hypothesis that more than 60 percent of the U.S. senators (of a total 100 senators) favor the president's economic plan, if a sample of 40 showed that 22 favor the plan (use alpha = .05).
The following data represents the amount of time in minutes that a person had to wait for a bus to work on a random sample of 5 working days.
Assume if random samples of size n = 9 are selected can we say anything about the distribution of sample means.
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
The probability she must stop at at least one of the last two signals is 0.8. Finally, the probability she must stop at at least one of the first and third Signals is also 0.8.
If the mailing list can be considered a random sample of the population, what is the chance that at least 1245 Macintosh users will receive the flyer?
The question is whether memebership in the aspirin group affects (lowers) the heart attack rate. Why is the question here different from the previous question? What would we expect to see if the two categories are independent?
you are a project manager in company ltd. and are assigned a new project that consists of nine major activities. these
A report states that 73% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.03 with 98% confidence?
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