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A simple random sample of size 100 is taken from a population. The population variance in unknown. The distribution of the standardised sample mean is a t-distribution. What are the degrees of freedom for this t-distribution?
the lifetimes in years of a certain kind of electronic component is a random variable having probability density
On a scale from 0 to 100, the mean level of economic development among the countries in the world is 65 and the standard deviation is 10. What proportion of countries in the world have economic development scores above 80?
1.a rbd on the number of insects was performed yielding the following table. test the constrast if insecticide 1 and 2
suppose that when a 7.0 earthquake hits it will destroy each highway independently with probability p 03. a town
An educational psychologist is interested in knowing whether the experience of attending preschool is related to subsequent sociability.
Drug testing of job applicants - In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 significance level, test the claim that the failure rate is now lower if a simple random sample of 1520 current job applicants ..
drake marketing and promotions has randomly surveyed 200 men who watch professional sports. the men were separated
seventy percent of the bicycles sold by a certain store are mountain bikes. among 100 randomly selected bike purchases
1. a survey was conducted to measure the height of ment. in the survey respondents were grouped by age. in the 20-29
What variables will be included, and collection methods used to obtain data. What is the population, sampling method used and why it is the best. Plan for data: describe what you will do with data once you have it, include types of graphs used and..
a golf ball is selected at random from a golf bag. if the golf bag contains 1 green balls6 brown balls and 8 orange
Finds the standard deviation of the time to prepare, copy and mail their tax return is 80 minutes. What is the standard error of the mean in this example?
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