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A quality control inspector has drawn a sample of 13 light bulbs from a recent production lot. If the number of defective bulbs is 2 or less, the lot passes inspection. Suppose 20% of the bulbs in
Assuming that other factors are held constant, which of the following would tend to increase the likelihood of rejecting the null hypothesis?
A study has show that a certain injured lion will capture it prey about once in every ten attempts.
The time until recharge for a battery in a laptop computer under common conditions is normally distributed with mean of 275 minutes and a standard deviation of 50 minutes.
The fill volume of an automated filling machine used for filling cans of carbonated beverage is normally distributed with a mean of 12.4 fluid ounces and a standard deviation of 0.1 fluid ounce.
Assuming that the average noise level of hospitals is what it's supposed to be, what is the probability of a sample of 81 hospitals producing an average as high as our sample's (p-value)? Which come
A survey of 400 cell phone users indicated that 55% were dissatified with their current provider. At a = .01, can you conclude that more than 50% of all cell phone users are dissatified with their c
Standard error of means decreases in proportion to the inverse of the square root of the sample size. A histogram of sample means will approximately follow a Normal distribution
The animal colony at a hospital contains 20 female rats and 30 male rats. Of the 20 females, 15 are white and 5 spotted. Of the 30 males, 15 are white, and 15 are spotted. Suppose that you randomly
A survey of 400 rural voters indicated that 250 favor annexation by the city. What is the margin of error for this survey at the 95% level of confidence?
Find the mean (expected) number of times the lion will be successful. Find the probability the lion will fail to capture it prey at least 25 times.
Whats the company's expected profit on the policy? What's the standard deviation?
A company manager thinks he overpaying fertilizer at $174 per ton. To find out, he collects fertilizer prices per ton from five distributors. Construct a 90% confidence interval from his result : 12
For what percentage of the samples did you reject the null hypothesis?5) The population mean in this problem really is 100 because of the way we set up the calculator so the null hypothesis is true.
Suppose we are given a probability distribution that has a mean if 9 and a standard deviation of 0.6. Use the Chebyshev inequality to find a lower bound estimate of the following probabilities:
A grocery supplier believes that in a dozen eggs, the mean number of broken en eggs is 0.5 with a standard deviation of 0.2 eggs. You buy 3 dozen eggs without checking them.
What should the carnival operator set the bet at such that on average he makes $0.50 profit a game? (That is, so the player loses $0.50)
Consider the following model for growth of a population. Each individual in the population lives exactly on time unit (so think of time units as generations) and has the ability to produce offspring
A manufacturer ships toasters in cartons of 10. In each carton, they estimate a 10% chance that one of the toasters will need to be sent back for minor repairs. What is the probability that in a car
An analyst must decide between two different forecasting techniques for weekly sales of roller blades: a linear trend equation and the naive approach. The linear trend equation is Ft = 127 + 2.0t, a
The mean stopping distance of Tire F is 51 feet with a sample standard deviation of 8 feet. the mean stopping distance of Tire M iss 55 feet with a sample standard deviation of 3 feet.
A poll was conducted to see how many teens have TVs, radios and computers. The results were:
1. In any given year, the number of huricanes that hit the Florida gulf coast has a Poisson distribution. The parameter of the distribution is itself random, and assumed to be uniformly distributed
A ball is drawn from urn A and then transferred to urn B. After that a ball is drawn from urn B. What is the probability the transferred ball was black given that the second ball drawn was white? (R
DFR Company has a service standard of 4.0 hours or less. During one week, a sample of 25 calls resulted in a sample mean of 7.0 hours with a sample standard deviation 10.0. can we conclude, statisti