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An independent consumer testing lab preformed a statistical test on 25 type-C alkaline batteries and calculated the mean life for a particular use before they failed was 22.5 hours. The distribution of the lives approximated a normal distribution. The standard deviation of the distribution was 1.1 hours. Information on the package states that the batteries should last 24 hours.
The test question was if this difference between the test statistics and the stated life of the battery was significant? The .05 significant level was selected for the test. Which is the correct statement?
A. The difference indicates that the batteries are not good.B. The difference was significant; the batteries do not meet the stated length of time.C. The difference cannot be evaluated with this small of a sample.D. The difference was not significant.
If were interested in studying obesity in a small sample size of 10 adult men by looking at their body weights and heights, would you say that trimming the mean is a good idea? What are the advantages of trimming the mean in this situation? What a..
Individual loss amounts (ground up) this year follow an inverse Weibull distribution with τ= 3 and expected value 1000. Next year you con?fidently expect loss amounts to in?ate by 10% uniformly across the board.
Compute the mean and variance of the following discrete probability distribution.
Given 7 male individuals in a Physical Education course, the number of sit ups each individual can do in a one minute period was recorded:
Arbitarily sampling one man and one woman from this population, determine probability neither is a Tay-Sachs carrier? Compute the probability both are carriers?
Describe a business-related situation in which you would expect there to be a strong relationship (correlation) between an independent and dependent variable.
Walleye is a common game fish. Adult walleye have a length with a mean of 44 cm and a standard deviation of 4 cm and the distribution of lengths is approximately Normal. What fraction of walleye are between 40 and 48 cm in length?
Furnish 2 offices each with a desk, chair, and file cabinet and 2 bookcases. At a local store there are 6 models of desks, 8 models of chairs 4 models of file cabinets and 10 models of bookcases.
A package of seeds states that the probability of germination is 0.92. For a package containing 75 seeds, the mean and variance of the number of seeds germinating are:
Pollsters attempt to find out whether or not person is a "likely voter" before they count their opinion in poll. If we suppose 40% of registered voters will really vote.
Is it likely that you will answer at least forty-four questions correctly on the test? Explain. John randomly guesses to answer each question. Is his score of thirty-four out of eighty-eight unusual? Explain
It's estimated that 57% of Americans live in households with 1 or 2 people, 32% live in households with 3 or 4 people and 11% live in households with 5 or more.
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