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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?
Determine the probability that: a) Exactly 3 will have this mild side effect.
What is the distribution of sample means.
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
Suppose that population has normal distribution. Determine a 95 percent confidence interval for population standard deviation sigma.
Compute the probability that randomly chosen student with a Master's degree majored in English or mathematics?
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
A local university administers a comprehensive examination to the recipients of a B.S. degree in Business Administration. A sample of 5 examinations are selected at random and scored. The test scores are 56, 85, 65, 86, and 93. At 98% confidence, ..
Alice and Bob agree to meet at the bus stop between 12 noon and 1pm. They each arrive at a random time in that interval and wait for 5 minutes before leaving, unless they see the other person. What is the probability that they meet each other?
If an overrun contract was bid at 12 million dollars, what does the least-squares line predict for the cost of overrun (as a percent of bid price)?
A sample of 50 male and 50 female infants were put on an experimental infant formula. After two weeks the parents of each infant were asked to fill out a questionnaire concerning infant satisfaction on the formula. One of the questions was "Did Ba..
Identify the type of sampling (random, systematic, convenience, stratified, cluster) used when a sample of people who smoke is obtained as described below.
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