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Find the 95% confidence interval for the variance of the weights of containers of motor oil if a sample of 14 containers has a variance of 3.2. Assume the variable is normally distributed.
a random sample of 100 observations from a quantitative population produced a sample mean of 26.8 and a sample standard
You are interested in knowing if there is a statistical difference in driving speeds between Day 1 and Day 10. Which statistical test would be appropriate? Why?
how many times should a coin be tossed to obtain a probability of equal to or greater than 0.9 of observing at least
If you have a body temperature of 99.00 °F, what is your percentile score? Convert 99.00 °F to a standard score (or a z-score).
With 95% confidence, what is the margin of error (to 2 decimals)? What is the 95% confidence interval estimate of the population mean?
The weekly salaries of teachers in one state are normally distributed with mean of $490 and standard deviation of $45. Determine the probability that a randomly selected teacher earns more than $525 per week?
a chemical engineer wants to fit a straight line to the data found observing the tensile strength y of 10 test pieces
A technician services machines as companies in the Phoenix area. Depending on the type of malfunction, the service call can take exactly 1, 2, 3, or 4 hours. The different types of malfunctions occur at the same frequency.
On a December day, the probability of snow is .30. The probability of a "cold" day is .50. The probability of snow and "cold" weather is .15. Are snow and "cold" weather independent events?
Population of consumers where 30% of them favored a new product and 70% of them disliked it. If 20 persons are sampled, what are the probabilities of finding: Binomial
you are picking a bouquet of 20 flowers for your mother at random from a garden with 25 coneflowers 35 daisies and 42
specimens of blood from 10 different animals were analyzed for blood count say y in units of 100 and packed cell volume
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