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One must select from a set of 12 components that are known to contain 4 faulty components. The selection is made at random so that the selection of any component is equally likely.
a. What is the probability of drawing exactly 1 faulty component if 3 different components are drawn?
b. What is the probability of drawing any faulty component if 3 different components are drawn?
Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households at random, what is the probability that every household has a cellular telephone?
What units represent the margin of error? Suppose you want to decrease the margin of error, but want to keep the 95% confidence interval. What do you need to do?
When the non-parametric statistics utilized? Write down an example.
As a part of the feasibility study, they wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees who use child care reveals the following amounts spent last week.
which is a value often used for the upper limit of the range of normal values. What do the results suggest about the sample group?
Should the finite-population correction factor be used? Why or why not?
Significant increase in the mortality of lung cancer in both genders, but no significant effect was observed at lower levels." Is this an observational study or an experiment? Fully explain your reasoning.
If a time series is stationary without a linear trend or the seasonal component, which of the following forecasting methods may be suitable.
A group of three students is to be randomly selected froma group of 1 freshman, 1 sophomore, 3 juniors and 3 seniors. Let Y1 and Y2 denote the number of juniors and seniors, a) What is the joint probability distribution for Y1 and Y2?
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
Normal with mean 48 months and standard deviation 9 months. The company has decided to give a guarantee for the sensors for 3 years. What % age of the sensors will not satisfy the guarantee.
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
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