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A manufacturer claims that the mean lifetime, mu , of its light bulbs is 48 months. The standard deviation of these lifetimes is 9 months. Ten bulbs are selected at random, and their mean lifetime is found to be 51 months. Assume that the population is normally distributed. Can we conclude, at the 0.1 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 48 months?
What is the critical value at .1 significance? Can we conclude the mean lifetime of light bulbs made by this manufacturer differs from 48 months?
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
If the names of these 100 people in the building are still unknown but a room is allowed to lodge one tenant at most , then are there how many ways of room occupation?
The market model relating the rate of return of stock XYZ (denoted RXYZ) to the rate of return Of a broader index of the stock market (denoted RM) is reported as:
A company sampled 40 of the springs that it manufactures for use in small engines and discovered that 20% of the springs did not meet specifications.
To determine the public's opinion of the police department, the police chief obtains a cluster sample of 15 census tracts within his jurisdiction and samples all households in the randomly selected tracts. Uniformed police officers go door to door..
The researchers found that subjects who answered immediately made the best decisions and that "the longer our participants thought about their answers, the more likely they were to include irrelevant information at the expense of relevant informat..
Construct a binomial distribution chart and table showing all of the outcomes if a woman would like to know all possible outcomes of having 3 children. Also show this using a probability tree diagram.
A record executive is interested in the popularity of her label's newest band, The Standard Deviations. She asks 10 people how many Standard Deviations songs they know.
Use a significance level of alpha = .05 to test the claim that p > .5. The sample is a simple random sample n = 50. Show how to calculate beta for the test and assume the true population proportion is .6.
What is the probability that a randomly selected cell phone bill is more than $67.75?
Incomes in the thousands of dollars were sampled in one region, they are as follows (1.5, 3.0, 4.2, 5.6, 2.6, 4.1, 0.9, 5.7, 5.4, 2.6) Assume the population is normal.
A random sample of 56 fluorescent light bubs has a mean life of 645 hours with a standard deviation of 31 hours.
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