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What is the probability of randomly sampling a set of 5 people out of this population who have a man IQ of 120 or greater?
In a poll of 600 randomly selected subjects, 240 answered "yes" when asked if they planned to vote in a state election. Construct a 95% confidence interval estimate of the proportion of all who plan t
Test the null hypothesis that the population mean for Medicaid enrolled women is 25% with a population standard deviation of 8%
You, of course, distrust him (you feel that it is much lower) and find that a random sample of 14 similar cars has a mean of price of $19,850 with a standard deviation of $1084. Is there enough evid
What is your estimate of the total amount spent by Americans of age 50 and over on restaurants and carryout food?
Calculate the expectation values and the variances for the for the random variable Y=2X + 5 for each of the different RVs X in the problem below:
Change the number from 53 to 14 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls.
Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.044; confidence level: 95%; and unknown
Use the given information to find the minimum sample size required to estimate an unknown population mean, µ.
For full marks use the coded method and round your answer to 1 decimal place. a) Find the slope for the trend-line. b) What is the intercept of the trend-line.
Develop a 95% confidence interval for the mean price charged by discount brokers for a trade of 100 shares at $50 per share.
Use these data and test to see whether the mean number of parts produced is the same with each method. Use a .05.
If one ticket is drawn, what is the expected value of the game? If two tickets are drawn, what is the expected value of the game?
A sample survey of 54 discount brokers showed that the mean price charged for a trade of 100 shares. Using the sample data, what is the margin of error associated with a 95% confidence interval?
Two samples of size 25 each yielding x-bar = 6.47, Sx = 1.14, y-bar = 6.17, and Sy =1.166 show a significant difference between means with a p-value of 0.3623.
What is the probability that the student answers more than 20 questions correctly? What is the probability the student answers less than? questions correctly?
Use the average of 2001, 2002 and 2003 as the base and determine indexes for 2005 and for the preliminary 2006 data using 100 as the base value.
Using the Poisson distribution, find the probability that five cars will arrive during the next fifteen-minute interval.
What is the probability that present value of the investment is less than $1,000? Greater than $20,000?
A social organization for tall people has a requirement that women must be at least 70 in tall. what percentage of women meet the requirements.
The diameter of a brand of ping-pong ball is approximately normally distributed, with a mean of 1.30 inches and a standard deviation of 0.04 inch. If you select a random sample of 16 ping-pong ball
A loan officer in a large bank has been assigned to screen 60 loan applications during the next week. If her past record indicates that she turns down 20% of the applicants, what is the approximate
Discuss the effect that sample size on the width of confidence intervals.
A time for the 100-meter spring of 15.1 seconds at a school where the mean time for the 100-meter sprint is 17.6 seconds and the standard deviation is 2.2 seconds. Find the z score corresponding to