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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?
For a population with µ= 40 and s = 7, find the -score for each of the following X values. (Note: You probably will need to use a formula and a calculator to find these values.)
Consider a null hypothesis that a new, unapproved drug is unsafe and an alternative hypothesis that a new, unapproved drug is safe. (a) Explain the risks of committing a type I or Type II error.
Assume that adults have IQ scores that are normally distributed with a mean of u=105 and a standard deviation o=15. Find the percentage of adults that have an IQ between 94 and 116.
Let X~N(1.3,2) the proportion and find the proportion
For a population with a mean of µ =70, a score of X = 62 corresponds to z = -2.00. What is the population standard deviation?
A distribution with a mean of µ = 62 and a standard deviation of s= 8 is transformed into a standardized distribution with µ= 100 and s= 20. Find the new, standardized score for each of
Shade the area that represents the proportion and find the proportion
Find the mean of the given probability distribution. The random variable x is the number of houses sold by a realtor in a single month at the sendsom's real estate office.