Questions from Statistics

Q: Briefly state in your own words the six guidelines that can be

Briefly state in your own words the six guidelines that can be used in establishing causality.

Q: Describe three levels of confidence in causality that are used in the

Describe three levels of confidence in causality that are used in the legal system, and briefly explain how these can be useful when we consider establishing causality with statistics.

Q: Researchers conducted animal experiments to study smoking and lung cancer because it

Researchers conducted animal experiments to study smoking and lung cancer because it would have been unethical to conduct these experiments on humans.

Q: If the hypothesis test of the claim described in Exercise 7 results

If the hypothesis test of the claim described in Exercise 7 results in a P-value of 0.757, what do you conclude about the null hypothesis?

Q: If a collection of paired sample data values yields a correlation coefficient

If a collection of paired sample data values yields a correlation coefficient of r = 1, then we can be very confident that causality is involved.

Q: You should always use the t distribution when the sample size is

You should always use the t distribution when the sample size is only n = 5.

Q: In testing a claim about a population mean, the t distribution

In testing a claim about a population mean, the t distribution is always used when the population standard deviation / is not known.

Q: You want to test the claim that the mean annual income of

You want to test the claim that the mean annual income of all movie stars is greater than $1 million, but you know that income data are not normally distributed (they are right-skewed). Therefore you...

Q: I was able to estimate the mean white blood cell count for

I was able to estimate the mean white blood cell count for the population of about 325 million people in the United States using a randomly selected sample of only 25 people.

Q: A simple random sample of IQ scores is selected from a normally

A simple random sample of IQ scores is selected from a normally distributed population of statistics professors. The sample statistics are n = 16, /= 130, and s = 10. Determine the critical value of t...