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1. It is claimed that two of three Americans say that the chances of world peace are seriously threatened by the nuclear capabilities of other countries. If in a random sample of 400 Americans, it is found that only 252 hold this view, do you think the claim is correct? Use α = 0.05. State any assumptions you make in solving this problem.
2. According to the Bureau of Labor Statistics (1996), the average price of a gallon of gasoline in all U.S. cities in the United States in January 1996 was $1.129. A later random sample in 24 cities found the mean price to be $1.24 with a standard deviation of 0.01. Test at α = 0.05 to see whether the average price of a gallon of gas in the cities had recently changed.
20 turn out to be over 65 inches tall, you get $20. Which is better: a sample of size 100 or a sample of size of 1,000? Choose one and explain. Does the law of average relate to the answer you give?
during a test period an experimental group of 10 vehicles using an 85 ethanol-gasoline mixture showed mean co2
Assuming that = 119.5 ng.ml, test the claim that the mean cotinine level of all smokers is equal to 200.0 ng/ml. Use a 0.05 significance level.
find the standard normal area for each of the following round your answers to 4 decimal places.standardnormal areaa
Describe three key lessons learned relative to ANOVA and Nonparametric tests. what concepts and analytic tools will you be able to use in your workplace?
A health insurance company charges policyholders a $1250 annual premium for health insurance for hospitalization. Find the insurance company's expected profit per policyholder
question a high volume production process produces on average 3.4 defective parts per hour and the number of defects
you need to estimate the mean number of travel days per year for outside salespeople. the mean of a small pilot study
Determine the regression line relating time (X) to concentration of drug (Y). Determine a 99% confidence interval for the slope parameter 13.
One month of the true difference and with 95% confidence if the range of all the data is 6 years? Use the appropriate tables in your book.
444 voters to predict whether the budget will pass. Suppose the budget has 53% of the voters. What is the probability that the newspaper's sample will lead it to predict defeat?
The standard deviation in cash bonuses is $15,618 and the standard deviation in annual pay is $28,077. The estimated slope of best fitting line relating x and y is?
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