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Braking distances of cars. A random sample of 13 four-cylinder cars is obtained and braking distances are measured and found to have a mean of 137.5 ft. and a standard deviation of 5.8 ft.
Sat verbal scores are normally distributed with a mean of 426 and a standard deviation of 94. Use the Empirical Rule to determine what percent of the scores lie between 332 and 426.
Using the full 5-step process test to see if a population mean is not 25. Sample data is: Mean 24, standard deviation 10 and a sample of 400 was taken.
A statistician was setting up a hypothesis test with a level of significance dictated by upper management. However, she was concerned that the test would return unacceptable type II errors. Which od t
Suppose that the census indicates the average American earns $36,345.45 per year. You are interested in the whether people who majored in political science earn an amount that is different than the av
What are the underlying assumptions of Spearman rank-order scale?
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.
The grades on a statistics midterm test are normally distributed with a mean of 78 and a standard deviation of 6
A manufacturer can typically process 176-264 devices a given period of concern. In this situation the processing event is either pass or fail.
Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 69 and 89?
Assuming everyone I ask says East, how does the probability change with the sample size? In other words, how is the probability different if 50 out 50 women say East instead of 5 out of 5 women?
Shaver Manufacturing, Inc., offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee per year followed the normal probability distribu
In a school how is ztest used in time table ... one group that studies 7 periods a day of 45 mins each class and the other group can choose semester wise classes and their time period is 90 mins
Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10. Females had a mean of 1
A Tamiami shearing machine is producing 10 percent defective pieces, which is abnormally high. The quality control engineer has been checking the output by almost continuous sampling since the abnorma
Discuss the assumptions for using a chi-square test. Research articles using and provide practical examples from the reseach to support your assumptions.
Discuss how the statistical application of Pearson r is used for hypothesis testing.l Through application of the Spearman Correlation discuss what type of data the Pearson formula can be used for.
The mean on this test is 3.5 with a standard deviation of .5. Sally scores 1.5 on this test. How many standard deviations is Sally from the mean?
Teens were asked in the MTF 2006 survey how often they think about social issues (specific issues were not identified). The bivariate table includes responses organized by teen's race.
Based on a two-tailed 0.05 What do you conclude?
The issue of how much should be spent to solve particular U.S. social problems is a complex matter, and people have diverse and conflicting ideas on these issues.
What is the research hypothesis? Should you conduct a one-or two tailed test? Why?
A psychologist has developed a test to measure self-control. The test is normed so that it has a mean of 100 and a standard deviation of 15... The scores are normally distributed in the population of
For the total population of a large southern city, mean family income is $34000, with a standard deviation (for the population) of $5000.
Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10.