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An irate student complained that the cost of textbooks was too high. he randomly surveyed 36 other students and found that the mean amount of money spent for textbooks was 121.60. If the standard deviation of the population was 6.36 find the best point estimate and the 99% confidence interval of the true mean.
estimate the population mean based on a sample of size 25 for which the average is 100 and the standard deviation is
If the sports report begins at 11:10, what is the probability that he misses part of the report if he waits until grading is done before turning on the TV?
How many spare tubes must the building custodian maintain to have at least 0.95 probability of replacing all failures on a given day?
alexander industries is considering purchasing an insurance policy for its new office building in st. louis missouri.
a car manufacturer claims that the miles per gallon for a certain model has a mean equal to 40.5 miles with a standard
Calculate the covariance
Testing for Population mean - Can the difference in average educational level between the sample and the nation be explained by chance variation?
Standard deviation of 12 years. Worker is stopped at random and asked to fill out questionnaire. Determine the probability that this worker is less than 30 old?
A researcher hypothesized that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability, u = 58. A random sample of 14 individuals wh..
question lottery. one million tickets are sold for a lottery in which a single prize will be awardeda if you purchase a
If random samples, each with n = 9 scores, are selected from a normal population with µ = 80 and σ = 36, then what is the expected value for the distribution of sample means?
Your friend also takes the test and obtains a score of 161.42 and is told that he is in the 22.8th percentile. What is overall mean and standard deviation of the test scores?
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