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A machine fills bottles with 64 fluid ounces of liquid. The quality-control manager determines that the fill levels are normally distributed with a mean of 64 ounces and a standard deviation of 0.42 ounce. He has an engineer recalibrate the machine in an attempt to lower the standard deviation. After the recalibration, the quality-control manager randomly selects 19 bottles from the line and determines that the standard deviation is 0.38 ounce. Is there less variability in the filling machine? Use a 0.01 significance level.
Suppose we conduct an ANOVA test of four treatment means and reject the null hypothesis. Construction of a confidence interval for the difference between the first and second sample mean revealed the interval to be 10 plus or minus 12. We conclude
The population of lengths of aluminium coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.20 inches. A sample of four metal sheets is randomly selected from a batch. What is the possibility that t..
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.81
an average of 15 aircraft accidents occur each year.a. compute the mean number of aircraft accidents per month.b.
you are given the following information obtained from a random sample of 4 observations from a large normally
What are the mean and standard deviation of the proportions of random samples of 400 motorcylce owners who own Harleys?
Gallup Polls When Gallup and other polling organizations conduct polls, they typically contact subjects by telephone. In recent years, many subjects refuse to cooperate with the poll.
The mean salary for engineers with less than 5 years' experience is $60,000 with a standard deviation of $5,000. Compute the z values for both 1)Rob and 2)Rachel.
The 46 computer mice inspectors at a particular factory can only inspect 45 mice per hour. Does the company have reason to believe that these inspectors are slower than average at α = 0.10?
Solving quadratic equations. Discriminant of a quadratic equation. Compute the value of the discriminant and give the number of real solutions to the quadratic equation.
In efforts to boost their identity, CherryBerry employs a famous spokesperson to advertise. A survey is then taken to assess the results of the ad campaign. The results show that 17 percent of the 1000 respondents can identify CherryBerry products. H..
The sample size of 8 and 10 respectively. cant it be concluded at alpha .05 that the average size of the famrs in the 2 counties are different? assume the populations are normallyh distributed.
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