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Tesearcher wants to estimate, with 95% confidence, proportion of adults who have high-speed Internet access. Her evaluations should be accurate within 1% of the true proportion.
a.) Determine the minimum sample size required using prior study that found that 54% of respondents said they have high-speed Internet access.
b.) No preliminary estimate is available. Determine the minimum sample size required.
The following payoff matrix has been developed for the decision problem. What is the opportunity loss when "A" is Investment alternative and "Decline" is state of nature?
I understand how to do a time series graph with one variable versus time in years, but I am not sure how to graph if the time is in months with more than one variable with a scatter plot.
If the population mean was $1047 in the previous year, does the evidence suggest that expenditure this year has significantly changed?
North Carolina State University looked at the factors that affect the success of students in a required chemical engineering course. Students must get a C or better in the course in order to continue as chemical engineering majors.
In the last municipal election, a sample of 350 registered voters showed that 85 voted for the incumbants. Find out a 98% confidence interval estimate for the proportion of all voters voting for the incumbants.
Derive the formula for the expected value Y, derive the formula for the moment generating function of Y
A sample of 25 concession stand purchases show a mean purchase of $5.29 with a standard deviation of $3.02. However, a later showing of the same movie, a sample of 25 purchases where the mean was $5.12 with a standard deviation of $2.14.
A random variable is normally distributed with a mean of 25 and a standard deviation of 5. If an observation is randomly selected from the distribution:
Dan Thompson, the president of CEO Airlines, recently noted an increase in the number of no-shows for flights out of Atlanta.
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?
Conduct a hypothesis test using the .04 level of significance to determine if there is a difference between the population means.
Now make a scatter plot of data from 1982 to 1998 (again, use years since 1800). Determine a linear, power, or exponential model that explains the crude oil production during this time period.
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