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Consider the formula used for confidence interval and the elements included in the formula. What happens to the confidence interval if cthe confidence level is increased, if the sample size is incr
An average of 15 aircraft accidents occur each year. Compute the mean number of aircraft accidents per month.
Do a dot plot of the absorbency data. Using only the values of the mean, median, and trimmed mean, do you have evidence of outliers in the data?
Find the sample variance, standard deviation, and range. Using the calculated statistics in parts (a) and (b), can you comment on the quality of the tires?
A population has a mean of 100 and standard deviation of 20. If you select a single score from this population, on the average, how close would it be to the population mean? Explain.
Based on the data, is there a significant difference in the average daily sales of this dog food based on shelf height? Use a 0.01 level of significance.
What role does sample size play in the accuracy of statistical inference? Why is the method of selecting the sample even more important than the size of the sample?
Find the minimum shape size n needed to estimate μ, find the given values of C, S, and E
At the 0.05 level of significance, test the manufacturer's claim that mean distance travelled before a major engine failure is more than 144,000 km.
The driller will go bankrupt if it drills 10 times before the first success occurs. What are the driller's prospects for bankruptcy?
Using α = 0.02, test the claim of the pharmaceutical company that the population mean is different from 600 mg. Would you by this cold medicine? Give your reasons.
How do you know when to use the minimization and maximization LP model?
In a linear programming problem, the binding constraints for the optimal solution are:
At the 0.01 level of significance, test the claim that the mean is less than 342 km. Should the storage yard be moved? Give your reasons.
Denote by X the number of cans selected that are underfilled. Find the probability that at least 1 underfilled can will be among those sampled.
Three people who do not know each other are standing in line at a movie theatre waiting for the box office to open. What is the probability that they were all born in the same month?
Use a significance level of α = 0.02 to test the claim that µ ≠ 64.8. The sample data consist of 12 scores for which the = 59.8 and s = 8.7.
Ten randomly selected automobiles were stopped, and the tread depth of the right tire was measured. The mean was 0.8 cm and the standard deviation was 0.2 cm. Find the 95% confidence interval of th
A homeowner plants 6 bulbs selected at random from a box containing 5 tulip bulbs and 4 daffodil bulbs. What is the probability that he planted 2 daffodil bulbs and 4 tulip bulbs?
When 20 toasters are randomly selected, find appropriate numbers x and y such that the probability that at least x of them will require repairs is less than 0.5.
When rolling a die, is this an example of a discrete or continuous random variable? Explain your reasoning.
According to this study, what is the probability that at least 3 of the next 5 people selected at random will hold this opinion?
A researcher wishes to estimate the average amount of money a person spends on lottery ticket each month. A sample of 50 people who play the lottery found the mean to be $19 and standard deviation
If x is a binomial random variable where n=100 and p=.1, find the probability that x is less than or equal to 12 using the normal approximation to the binomial.
It is common in many industrial areas to use a filling machine to fill boxes full of product. What is the probability that the machine either overfills or underfills?