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A company manufactures light bulbs. The company wants the bulbs to have a mean life span of 1000 hours. To maintain this average, random samples of 16 light bulbs are periodically tested. If the t-value falls between -t0.99 and t0.99, the company will be satisfied that it is manufacturing acceptable light bulbs. A sample of 16 light bulbs is randomly selected and tested. The mean life span of the sample is 955 hours and the standard deviation is 35 hours. Is the company making acceptable light bulbs? Assume life spans are normally distributed.
A state executive claims that the average number of acres in western Pennsylvania State Park is less than 2000 acres. A random sample of five parks is selected, and the number of acres is shown. At alpha=.01, is there enough evidence to support th..
Construct a 95 percent confidence interval for the mean number of misspelled words in the population of student essays.
Using the data, construct a 95% lower confidence interval on mean battery life. Why would the manufacturer be interested in a one-sided confidence interval?
What is the probability that none of three randomly selected persons is allergic to this drug? Assume that all three persons are independent.
The membership for the club this year isobserved to be 14 freshman, 19 sophomores, 51 Juniors and 16Seniors. At 95% level of confidence, test the advisors belief..
A financial analyst wants to compare the turnover rates, I percent, for shares of oil-related stocks versus other stocks, such as GE and IBM. She selected 32 oil related stocks and 49 other stocks.
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
Given that a Brand A battery just failed, what is the expected value of the time we wait until the next Brand B failure?"
A standard deviation of 50. If an applicant is randomly selected, find the probability of a rating that is between 170 and 220. help solve statistics.
Test the claim about population mean, u, at given level of significance using given sample statistics. Find out critical value(s).
A lumber company has claimed that the standard deviation for the lengths of their 6 foot boards is 0.5 inches or less. To test their claim , a random sample of 17 six-foot boards is selected
How many plants must be sampled if no preliminary estimate is available? If less than that many plants is sampled, which answer best describes what happened?
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