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A company claims that mean lifetime of their product line of super fluorescent tubes is 1600 hours. You randomly sample and test 100 tubes from their warehouse and measure mean lifetime of 1570 hour
A maker of fabric for clothing is setting up a new line to "finish" raw fabric. The line will employ a dyeing cycle time of either 30 minutes or 40 minutes; and temperature of either 150 or 175 Cels
A 99% confidence interval determine for population mean was computed to be (26.3, 38.7). Find out the mean of the sample, which was used to find out the interval estimate (show all work).
A tour guide is trying to find out if fishing trips to Alaska would be popular enough to make them money. They need 3.5% of eligible people to go in order for it to be profitable trip. They survey 1
In a league championship of three games, the winner will win two games. The Cubs are playing the Bears. The independent probability that the Cubs will beat Bears in single game is 0.3. Determine the
In the study of adult green sea urchins it was found that their weights are normally distributed with the mean of 52.0g and standard deviation of 17.2g. Determine the percentage of adult green sea u
Conduct ANOVA comparing the anxiety levels (at posttest only) of participants across all 3 treatment situations: CBT, psychodynamic, and supportive therapy.
On the basis of survey data, would you suggest that the housing office consider rising the amount of housing upon campus available to graduate students? Provide appropriate statistical evidence to s
A simple random sample of nine female fashion models has mean height of 70.0 inches with standard deviation of 1.5 inches. Employ a 0.01 significance level to test claim that mean height of fashion
A large supermarket chain will raise its stock of bakery products if more than 20% of its customers are purchasers of bakery products. A random sample of 100 customers found 28% purchased bakery ite
The times of first sprinkler activation for series of tests with fire prevention sprinkler systems using aqueous film forming were (in sec).
Suppose the distribution of tire wear for a radial brand of auto tire is approximately normal with a mean of 48,000 miles and a standard deviation of 2,000 miles.
Test these hypotheses using alfa=0.05. What are your conclusions? Determine the P value for this test. Develop a 95 percent confidence interval on the mean shaft diameter.
A person is chosen at random. Determine the probability that given that person is married, he or she is stock clerk. Provide your answer as a fraction or as number rounded to three decimal places.
A box of candy contains six chocolate-covered cherries, 4 peppermints, 3 caramels, and 3 strawberry creams. Determine probability of selecting 2 of each candy. Give your answer as a fraction or as a
A recent study of 200 people in Miami found 54 were obese. Determine the 95% confidence interval of the true proportion of individuals living in Miami who are obese?
A bank's loan officer rates applicants for the credit. The ratings are normally distributed with mean of 200 and standard deviation of 50. If applicant is randomly chosen, determine the probability
A private school wanted to make certain it isn't overpaying their substitute teachers. Determine the maximum amount they should use for their mean daily salary for substitute teachers?
Suppose that quarters have weights that are normally distributed with mean of 5.67 g and standard deviation fof 0.0700 g. If a vending machine is adjusted so that 15% of legal quarters are rejected
Use standard normal distribution to approximate. Seventy-seven percent of homes have a telephone answering device. In a random sample of 290 homes, what is the probability that 200 or less do not ha
Assume the average age of a registered vehicle is 72 months or 6 years. Assume the standard deviation is 12 months. A vehicle is selected at random, find the probability that it is MORE than 80 month
Technology is dramatically changing the way we communicate. In 2011, a survey of 880 us household showed that 149 of them us email. At the 1% signfance level, test the claim that more than 15% of us
To measure the results of the man's experiment, first find the probability distribution of the gain x on a single $5 bet. Determine the expected value and variance of the gain x from part 1.
Randomly chosen statistics students of mr. john's class participated in a experiment to test their capability to find out when 1min has passed. Forty student yielded the sample mean of58.3 sec and s
Which of the following explains a typical distribution of F-ratios?