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Smoke detectors are highly recommended safety devices for early fire detection in homes and businesses. It is vital that the devices be nondefective. Suppose 100 Brand A detectors are tested and 12 fail to emit a warning signal. Subjected to the same test, 15 out of 90 Brand B detectors fail to operate. State the alternative hypothesis that would be used to determine if Brand A has a higher proportion of defective smoke detectors than Brand B. Calculate the test statistic for determining if a difference exists between the failure rates of the two smoke detector brands.
Find the expected value of the number of tests taken.
Use this information to compute a 95% confidence interval for average number of credit cards carried by students.
In a public opinion poll, 48% of 189 respondents favor an elimination of taxes on dividend income.
What is the probability that in a sample of 10 pieces: 5 or more will be defective?
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
The probability of the patient being chosen at random as having meningitis as only site of infection is?
Service A delivers the document with probability 0.9, Service B with probability 0.9 and Service C with probability 0.8. What is the probability that at least one copy of the document will be delivered on time?
Explain the effect that changes in η and β have on the shape of the Weibull density and the effect that they have on γ3 and derive an expression for the coefficient of skewness for the Weibull distribution.
Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet.
Find the minimum amount of water pumped in 30 days. Let y be the total number of gallons pumped x days after pumping being. Note that (0,0) is on graph of the equation.
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = . 05, does vehicle type vary by mall location?
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national exercise rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and find..
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