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In the case of Castenedav. Partida, it was found that during a period of 11 years in Hilda County, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry. Among the people eligible for grand jury duty, 79.1% were Americans of Mexican ancestry. We shall use a 0.01 significance level to test the claim that the selection process is biased against Americans of Mexican ancestry.
a) Set up the null and alternative hypotheses, and perform the hypothesis test.
b) Does the jury selection system appear to be fair?
Compute mean, standard deviation, coefficient of variation and 5 key percentiles for these data.
If researcher obtains sample mean of M = 88, which combination of factors is most likely to result in rejecting null hypothesis?
Indicate which would be the independent variable and which would be the dependent variable in each of the following:
Is there evidence that teams with higher total payrolls tend to be more successful? Justify your answer.
Now make a scatter plot of data from 1982 to 1998 (again, use years since 1800). Determine a linear, power, or exponential model that explains the crude oil production during this time period.
What is the value of the population mean? What is the best estimate of the value?
Given that a respondent is over age 50, what is the probability that he or she gets news primarily from newspapers?
Compute the mean and variance of the following discrete probability distribution. A cola-dispensing machine is set to dispense on average 7.00 ounces of cola per cup. The standard deviation is 0.10 ounces. The distribution of amounts dispensed foll..
They found that those with higher levels of cigarette use had lower GPAs, and vice versa. What can you rightfully conclude from this? Why? Be specific about what this kind of information may indicate and mean.
Suppose we want to compare the observed and expected number of events among the group 250 treatments.
In the following questions, you should demonstrate your understanding of sampling distribution:
What is an interaction? Describe an example and identify the variables within your population (work, social, academic, etc.) for which you might expect interactions?
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