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The total number of cars and light-duty trucks sold in 2013 was 2.234 million while 1.346 million were sold in 2009. Compute the market share for each of the companies.
What is the approach to determining the difference between two samples, once you have determined that all of the samples are not the same?
How well do exams given during the semester predict perfomance on the final? One class had 3 tests during the semester. Computer output of the regression gives:
Professor Alpha and Beta both teach statistics. The following table shows the distribution of their final grades. We wonder whether one of these professors is an "easier'" grader
A random sample of students was weighed after their first week of their first semester and weighed again after their final week of their first semester. Is there strong evidence that the students ga
Based on your sample result, calculate a 95% Confidence Interval for the true population value. Calculate a 95% Confidence Interval for the proportion of heads.
A researcher conducts a study of white and black attitudes toward the police in her community.
Explain the difference between the information given by a test of statistical significance, such as Chi Square, and a measure of association, such as Pearson's correlation coefficient.
A genetic experiment involving peas yielded one sample of offspring consisting of 414 green peas and 153 yellow peas. Use a 0.01 significance level to test the claim that under the same circumstance
"Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Identify the P-value, critical value(s), and state the final conclusion that ad
Completion time (from start to finish) of a building remodeling project is normally distributed with a mean of 200 workdays and a standard deviation of 10 workdays. To be 99% sure that we will not b
In a 2 X 3 X 3 analysis of variance, the number of cells is?
You flip a coin 60 times. You get heads 45 times and tails 15 times. Calculate a 95% Confidence Interval for the true population value. Calculate a 95% Confidence Interval for the proportion of hea
Use a 0.05 significance level to test the claim that the mean tar content of filtered 100mm cigarettes is less than 21.1mg, which is the mean for unfiltered king size cigarettes. What do the results
Assume that a simple random sample has been selected from a normally distribution population and test the given claim. Identify the null and alternative hypotheses, test statistic, p-value, critica
In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. T
Suppose a researcher gathered survey data from 19 employees and asked the employees to rate their job satisfaction on a scale from 0 to 100 (with 100 being perfectly satisfied). Suppose the followin
The statistical procedure ensures that the alpha level for any given planned contrast will not exceed .05 is
Find the percentage of women meeting the height requirement. Are many women being denied the opportunity to join this branch of the military because they are too short or too tall?
Assume the reading on thermometers are normally distributed with a mean of 0 Celsius and a standard deviation of 1.00 Celsius. Find the probability that a randomly selected thermometer reads between
A study found that the average time it took a person to find a new job was 3.5 months. If a sample of 30 job seekers was surveyed, find the 90% confidence interval of the mean. Assume the standard d
In an analysis of variance, if the null hypothesis is true, then: the research hypothesis can also be true.
A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 99% confident that her estimate is correct. If the standard deviation is $1050, how la
Find the probability that the return for common stocks will be greater than 16.32%. Find the probability that the return for common stocks will be greater than 5.89%.