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Assume that a random variable, x, is distributed according to a normal distribution with mean 46 and standard deviation 12.
a) What is the standard error of the estimate, x-bar, if a sample of size 25 is taken?
b) By how much does the standard error of x-bar change if the sample is increased to 100?
If we know that the length of time it takes a college student to find out a parking spot in library parking lot follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute
How does bell-shaped curve for sampling distribution of sample means for samples of size n =120 compare tobell-shaped curve for sampling distribution of sample means for samples of size n =95?
If the manufacturer's claim is true, what is the probability that the claim will be rejected?
A machine fills containers with a mean weight per container of 16oz. If no more than 5% of the containers are to weigh less than 15.8oz, what must the standard deviation of weights equal?
Build a scatter plot, Find the value of the linear correlation coefficient r, and find the critical value of r using α=0.05. Determine whether there is sufficient evidence to support a claim of a linear correlation between the two variables.
Could mud-wrestling be the cause of a rash contracted by University of Washington students in the spring of 1992? Two physicians at the University of Washington health center wondered this when one male and six female students complained of rashes..
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution.
Create a histogram for the following data of the number of miles from residence to place of employment for 30 randomly selected residents of Middletown County.
Conditional and compound probabilities.The table below gives the distribution of blood types by gender in a group of 1000 individuals.
Calculate the correlation coefficient. What is the coefficient of determination from these sample statistics? What does this coefficient indicate?
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams?
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