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In 2011 a sruvey by the American Bar Association indicated that the average yearly income of attorneys was $110,000. A sample of 81 attorneys was taken in 2012 and it reflected an average yearly income of $120,000. Assume the standard deviation of the population of attorneys in 2012 is $36,000.
We want to test to determine if there has been a significant increase in the average yearly income of attorneys. Provide the null and the alternative hypotheses.
Compute the test statistic.
Determine the p-value; and at 95% confidence, test the hypotheses.
What information is provided by the numerical value of the Pearson correlation? For the following scores, compute the Pearson correlation:
Suppose that you wish to perform a nonparametric test for a difference among the medians of three or more independent populations. Which of these tests would be appropriate?
assume that a quality characteristic is normally distributed. an x-bar control chart is constructed with 3 sigma
A psychologist is studying the distribution of IQ scores of girls at an alternative high school. In wishing to estimate the average IQ scores in this school.
1. at one point during a fatigue test the rate of crack growth is measured as 0.57mmcycle. if the constants are known
The following table provides the weight in grams of a sample of 50 bags produced in one hour by a single machine: Compute the arithmetic mean and median.
Using the confidence interval method, test the claim that the average age of consumers is at least 30 years ( α= 0.05). Test the same claim by using the test statistics method ( Z or T test).
The state's smallest animal is a red-tailed gerbil, with a mean weight of 2.5 grams and a standard deviation of 0.25 grams. Assuming that the weights are normally distributed
What is the level of measurement for the variable, "political ideology" measured as "Very Conservative", "Conservative","Moderate", "Liberal" and "Very Liberal".
What is the arithmetic mean selling price?
Schlepsi has contracted with AluminiCorp to produce special beverage cans for an upcoming promotion. They want 25% of the Schlepsi cans produced by AluminiCorp to be imprinted with the phrase 'A Winner is You!' along with a promotion code for the ..
1. a researcher sends a questionnaire to 6000 individuals. she gets back 5000 responses. the percentage of women among
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