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The following are the overall miles per gallon (MPG) of a sample of 2009 sedans priced under $20,000.
(27,31,30,28,27,24,29,32,32,27,26,26,25,26,25,24).
Construct a 95% confidence interval for the population mean, assuming a normal distribution?
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
What is the rejection point at α = .01 and indicate if you would accept or reject H o ?
A population of 1000 students spends an average of $10.50 a day on dinner. The standard deviation of the expenditure is $3. A simple random sample of 64 students is taken.
The probability of drawing a 6 (to complete an inside straight) after discarding the ace.
There are 6 children in a family. The number of children defines a population. The number of simple random samples of size 2 that are possible equals:
According to the Sleep Foundation, the average night's sleep is 6.8 hours. Assume the standard deviation is 0.6 hours and the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 hours?
Why might driver be tempted not to use seat belt "just on this trip"?
When would you use hypothesis testing and when would you use confidence intervals?
Which of the following models are appropriate to forecast a time series whose amplitude increases over time?
Find the value of the standard normal random variable z, called z 0 such that:
What proportion for smoking teenagers think their peers care a lot about keeping their weight down?
Compare his performance on the two tests in terms of percentile ranks. In which exam did he do better? Please show computations and discuss.
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