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In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.
Find out 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
Suppose a research firm conducted a study to determine the average amount of money steady smokers spend on cigarettes during a week.
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
Suppose that 30% of the population has black hair. In a randomly-selected group of six people, how probable is it that
As a bonus, students are encouraged to research new and interesting articles/ websites/ interactive tools, etc. which are pertinent to the class material.
The data was used to make inferences regarding the other students taking the course. Construct a 95% confidence interval estimate. Explain your findings so that your non-quantitative partner will understand them. Their data is below:
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be:
If we are dealing with non-normal data we use Chebychev's Theorem. While not as precise, it does provide some level of utility. If we use Chebychev
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
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