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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
what requirements are necessary for a normal probability distribution to be a standard normal probability distribution?
How is the rejection region defined and how is that related to the zscore and p value?
Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,225 per hour and a standard deviation of $275.
A sample of n = 7 scores has a mean of M = 9. One score in the sample is changed from X = 19 to X = 5. What is the value for the new sample mean?
Suppose that we are testing H0: µ = µ0 versus H1: µ > µ0. Calculate the P -value for the following observed values of the test statistic (round all answers to 4 decimal pl
How many workers need to be sampled in order to estimate the population proportion of workers who worried about retiring comfortably to within +/- 0.02 with 95% confidence?
How many times should a coin be tossed to obtain a probability of equal to or greater than 0.9 of observing at least one head?