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A random sample of size 9 is collected from a normally distributed random variable. The sample mean is 6.507 and the sample variance is 3.99. An exact 80% confidence interval for the mean of the random variable is required.How should you calculate confidence interval using quantiles from a t-distribution and with how much degree of freedom? Is it approprait to use in calculating the confidence of interval quantiles from a normal distribution?Explain and show work.
the probability that a person will have 01 or2 dental checkups per year is 0.3 0.6 and 0.1 respectively. if seven
find the probability distribution for the number of jazz cds when 4 cds are selected at random from a collection
Test the null hypothesis that a population mean is 50 against the alternate hypothesis that the mean is not 50. What "model" should be used and why?
Create the acceptance-rejection technique for creating the geometric random variable, X, with parameter p on range {0, 1, 2, ...}.
Calculate a standard error for the sample mean production rate for the new method and what is the standard error of the $1600 estimate?
(a) Consider a normal distribution with mean μ = 88. If 2% of the values lie below x = 50, find the standard deviation σ. (b) Consider a normal distribution with standard deviation σ = 15.6. If 10% of the values lie above x = 17.2, find the mean μ.
The grades on the midterm given in a large managerial stats class are normally distibuted with mean 75 and standard deviation 9. Instructors of this class wants to assign an A to top
the amount spent on their first visit is approximately normal, what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for μ?
What's the probability that among three randomly selected high school students
a package of twelve ping-pong balls contains two defectives. an inspection procedure to check on the quality of the
1.i want to know which of two manufacturing methods will be better. i create 10 prototypes using the first process and
We are establishing a quality control program for a process and need to establish the mean and standard deviation for the process. The first 10 batches had samples of size 5 taken.
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