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A company has developed a new ink-jet cartridge for its printer that it believes has a longer lifetime on average than the one currently being produced. To investigate its length of life, 240 of the new cartridges were tested by counting the number of high-quality printed pages each was able to produce. The sample mean and standard deviation were determined to be 1511.4 pages and 35.7 pages, respectively. The historical average lifetime for cartridges produced by the current process is 1502.5 pages. At α = .05, test the claim that the new cartridge has a longer lifetime.
a population has a standard deviation of 22 units. give your answers correct to two decimal places.a find the standard
Now they need your help to determine if the mean number of news shows watched in your neighborhood is similar to the national mean.
The data below show the number of registered automatic weapons, in thousands, and the murder rate, in murders per 100,000, for eight randomly selected states. a. Determine the correlation coefficient between the number of automatic weapons and the ..
the tensile strength of paper is modeled by a normal distribution with a mean of 35 pounds per square inch and a
ifteen watch springs are selected from the production line and measured; their weights are 8, 3, 4, 8, 1, 4, 4, 9, 9, 2, 8, 4, 9, 7, and 7 grams. Assume = 0.01.Determine which test statistic is appropriate (chi-square or F), and calculate its value..
How to Find Expected Mean
If you had a research problem appropriate for ANOVA and it was based on the results from three samples, what would be the null hypothesis?
the body mass index bmi of an individual is one measure that is used to judge whether an individual is overweight or
Compute the mean and standard deviation of the scores and use these for the calculations below. Show your calculations on the back of his page.
A leasing firm claims that the mean number of miles driven annually, m, in its leased cars is less than 13280 miles. A random sample of 150 cars leased from this firm had a mean of 12584 annual miles driven.
Known population of 1000 students to construct a 95% confidence interval for teh average SAT score. What correction factor should be used to compute the standard error?
components used in a digital slr camera are manufactured with nominal dimension of 0.3 mm and lower and upper
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