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In an opinion survey, a random sample of 1000 adults from the U.S.A and 1000 adults from Germany were asked whether they supported the death penalty. 590 American adults and 560 German adults indicated that they supported the death penalty. The researcher wants to know if there is sufficient evidence to conclude that the proportion of adults who support the death penalty is higher in the U.S.A. than in Germany. What is the decision at a =.05 and 0.10.
Obtain and interpret the 40th percentile for the finishing times and part D) find and interpret the eighth decile for the finishing times.
What is the 95% confidence interval estimate of the population mean examination score if a sample of 200 applications provided a sample mean ? (4%)
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
Chance of tripling your investment in a year and a .3 chance of halving your investment in a year. What is the standard deviation of the rate of return on this investment?
Kyle averages 7 finished accounts a day. His standard deviation is 2 account per day and we wish the probability that Kyle will finish day with more than 8 finished accounts. Probability will be?
Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
Whirltag claims that the useful lifetime of its dishwashers is normally distributed with a mean of 3 years and a standard deviation 1 year.
The following data represents 15 quarters of manufacturing capacity utilization (in percentages) Evaluate three and four quarter moving average for this time series. Which moving average provides the better forecast for the fourth quarter of 2003?
Find the mean, median, mode, sample variance, and range. Do you think that this sample might have come from a normal population? Why or why not?
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
To be from the same population? You may assume the that follows a normal distribution. values are: 2.13 1.31 1.91 1.92 1.77 1.64 2.29 1.99 2.33 2.49 2.22
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
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