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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?
Scores on a test are normally distributed with a mean of 60.9 and a standard deviation of 12. Find P81, which separates the bottom 81% from the top 19%.
Find the average cost of a loaf of bread in your area and compute the cost per day for one year. (Remember that average is the mean, median, mode, and midrange, but choose the best for the data.) 1. What measures of central tendency did you use?
Muscular dystrophy is an incurable muscle-wasting disease. The most common and serious type, called DMD, is caused by a sex-linked recessive mutation. Specifically; women can be carriers but do not get the disease; a son of a carrier has probabili..
Set up null hypothesis for associated F test.
Probability based on normal distribution. Suppose among X has a normal distribution, and find the indicated probability.
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
Calculate the average of deposits per bank for FDIC- inured institutions during both time periods and describe the relationship between the two averages. Provide a reason for the difference.
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
Given what you've learned in this module about the meaning of "statistics", choose one of the examples from Part I (A-F), and raise a relevant question of your own that could be answered by a statistician.
Suppose a simple random sample of 20 non-English student have an average math score on the SAT exam of 528. What are the appropriate hypotheses?
Finding the probability value for the given data using normal approximation
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in the California and finds tha..
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