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In a recent study of Vietnam veterans, researchers found that in a sample of 2101 veterans, 777 had been divorced at least once. Assuming that these veterans were a simple random sample from the population of all Vietnam veterans, find a 90% confidence interval for the proportion of the population who have been divorced at least once. Write a confidence statement.
a car traveling 90 kmh strikes a tree. the front end of the car compresses and the driver comes to rest after traveling
a researcher performs a hypothesis test at the 0.05 level of significance. the null hypothesis is p 0.85and the
you toss a die and your payoff is fx 0 if x 0 x 2 otherwise. what is the optimal strategy and what is your expected
propane is contained in a closed rigid container with a volume of 10 m3. initially the pressure and temperature of the
consider a multiple regression model y beta0 beta1 x1 beta2 x2 beta3 x3 to fit these data which consist of
a voltmeter is used to read the potential difference accross the poles of a battery.the battery is rated at 20 v. the
what is the specific volume of water at 50 mpa and 80 degrees celcius. what would it be if the incompressible liquid
the electrical resistance on a long piece of wire is r. the wire is streatched to be twice as long and because the
suppose you have a histogram that shows relative frequency. how do you calculate the proportion of the sample that lies
a civil engineer must design a wheelchair accessible ramp next to a set of steps leading up to a building. the height
does the incidence of internal or external validity show poor preparation or are these to be
Test hypothesis that two processes have identical fractions nonconforming. Use a = 0.05. Create 90% confidence interval on difference in fraction nonconforming between two processes.
on a certain examination the average score is 53 and the standard deviation is 6. find a range of values within which
Don Levine Corporation is considering adding an additional plant to its three existing facilities in Decatur, Minneapolis, and Carbondale. Both St. Louis and East St.Louis are being considered.
a paired t-test was performed to test the null hypothesis h0 ?d 0 versus the alternative h1 ?d ? 0. the observed test
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time (0 decimals)?
Test at the 1% significance level whether currently all adult men spend less than 11 hours per week watching sports on tv. Calculate the p-value for this problem and conduct the test using the p-value method.
Rob earns $50,000 per year. The mean salary for engineers with less than 5 years experience is $60,000 with a standard deviation of $5000. What is the Z value of Rob?
Makaela took a spanish exam; her grade was 79. The distribution was normally shaped with xobt =70 and s = 12. Jaun took a history exam; his grade was 86
A poll found that 69.9% of citizens felt the government was not working well. If 7 people were randomly selected, what is the probability that all 7 felt the government is not working well?
A University Counseling Clinic is interested in predicting the levels of depression from the number of social events attended per week by a sample of their clients. The data are below:
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
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