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What is the sampling distribution of sample means?
What is the mean of the sampling distribution of sample means?
What is its standard deviation?
How is that standard deviation affected by the sample size?
What does the central limit theorem state about that distribution?
Triathalon Times Jeff Parent is a statistics instructor who participates in triathalons. Listed below are times (in minutes and seconds) he recorded as riding a bicycle for five laps through each mile of a 3-mile loop.
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
A least squares linear trend line is just a simple regression line with the independent variable being time (months or years for example).
A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a person in Africa is selected at random
Testing for population mean - What happens as you use different levels of significance? Different values of the standard deviation?
Prepare an ANOVA table and test the null hypothesis of no linear relationship between the two variables.
Determine Probability using exponential distribution.The average time between failures of a laser machine is exponentially distributed with the mean of 40,000 hours.
At a .10 level of significance, use Stat Tools (or Excel) to test the sponsors' hypothesis. State the null and the alternative hypotheses and the decision rule. Finally, discuss your findings.
A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours.
Calculated the probability of observing a sample proportion of voters 0.55 or higher supporting the incumbent governor.
The participants in a television quiz show are picked from a large pool of applicants with approximately equal numbers of men and women.
Assuming that all other variables are held constant, explain how the value of z influenced by each of the following:
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