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The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
Why can't the researchers draw a causal connection between type of food and later intelligence? Please provide authentic solution of this problem.
A multiple choice test has 20 items with four possible answers given for each item. 12 is the minimum passing score.
suppose you want to estimate the population proportion of statistics nerds at college. to do so you take a sample of
Overall, the survey contacted 1302 men and claims a margin of ±2.9% error of Why is the margin of error different for your confidence interval?
One of the top-selling video games continues to be Madden NFL 09 published by Electronic Arts. While prices vary widely depending on store, the suggested retail price for this video game is $46. The file entitled Madden contains a random sample of ..
Assume that a simple random sample of a population has been selected from a population that has a normal distribution, Use the formula for X2( chi square distribution) and the chi-square distribution table
Compare and contrast the similarities and differences between the two scores and explain when and why you would use each.
Again referring to the data in 'odometer' from AnzacG.xls and the population from which it is drawn, determine the sample size required to estimate the population mean to within 5,000 kms with 90% confidence. Again assume the population standard d..
Find the probability the total amount you go home with is at least 0 (you have broken even, or went home with some positive gain).
Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and conditions are satisfied before you proceed.
The changes on different days are assumed to be independent. What is the probability that after 2 days the stock will be at its original price? What is the probability that after 3 days the stock's price will have increased by 1 unit?
Can the researcher conclude that his sample is significantly more intelligent than a population with a mean of 100?
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