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1. Seventy-six percent of products come off the line within product specifications. Your quality control department selects 15 products randomly from the line each hour. Looking at the binomial distribution, if fewer than how many are within specifications would require that the production line be shut down (unusual) and repaired?
2. Sixty-one percent of employees make judgements about their co-workers based on the cleanliness of their desk. You randomly select 8 employees and ask them if they judge co-workers based on this criterion. The random variable is the number of employees who judge their co-workers by cleanliness. Which outcomes of this binomial distribution would be considered unusual?
3. A supplier must create metal rods that are 18.1 inches long to fit into the next step of production. Can a binomial experiment be used to determine the probability that the rods are correct length or an incorrect length?
4. Fifteen golfers are randomly selected. The random variable represents the number of golfers who only play on the weekends. For this to be a binomial experiment, what assumption needs to be made?
What percentage of men are too tall to fit though a standard doorway without bending, and what percentage of women are too tall to fit through a standard doorway without bending?
Determine the test statistic and p-value considering any necessary assumptions. Decide whether to reject or not reject the null hypothesis
Metal detectors at airports are used to determine whether passengers are carrying weapons. If the null hypothesis states that a passenger isn't carrying a weapon, a type I error would occur whenever
a student asked to give a class demonstration of the use of an ordinary t-statistic confidence interval for comparing
a semiconductor company wants to estimate the fraction of defective computer chips it produces. suppose that a random
the incidence of a certain disease in the population is estimated to be 1.0 . that is the probability that a randomly
Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
Does the evidence suggest that the volume of Google stock has changed since 2007? Use a 0.05 level of significance.
Give a 99% con?dence interval for the average number of miles that may be driven on a tire of this kind.
When Gallup asked the same question in 2001, only 45% of those respondents agreed. Is it reasonable to conclude that there was a change in public opinion given that the P-value is 0.37? Explain.
What is the difference between staged and straightforward manipulations of an independent variable?- What are the general types of dependent variables?
Mean and median The figure below displays two density curves, each with three points marked. At which of these points on each curve do the mean.
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