Stats: Statistics and Two-tailed Hypothesis Test

Topics: Statistics, Standard deviation, Arithmetic mean Pages: 2 (531 words) Published: June 28, 2012
A company with a large fleet of cars found that the emissions systems of 18 out of the 65 randomly selected cars they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance? Test the appropriate ... Wednesday, May 11, 2011 at 2:18am by Erica

Applied Statistics
Assignment Guidelines Perform a two-tailed hypothesis test using the steps outlined in the assignment description. In a Word document, create a report that includest the following: Null and alternate statements. Pasted Microsoft Excel data output. Identification of the ... Sunday, October 23, 2011 at 6:05pm by Truth

Null hypothesis: Ho: p = .80 -->meaning: population proportion is equal to .80 Alternate hypothesis: Ha: p does not equal .80 -->meaning: population proportion does not equal .80 Using a formula for a binomial proportion one-sample z-test with your data included... Friday, June 4, 2010 at 8:36pm by MathGuru

The amount of time a bank teller spends with each customer has a population mean of 3.10 minutes and standard deviation of 0.40 minute. If a random sample of 16 customers is selected, a) what assumption must be made in order to solve parts (b) and (c)? b) what is the ... Saturday, April 7, 2012 at 12:06pm by Nancy

18. Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a control group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test (with an estimated population standard ... Saturday, February 20, 2010 at 1:32pm by Doris I

Read this article, and think about what sociologists might study on this. It fits with new definitions of marriage and family. Like it or not, we have to understand how to function as a society with this statistic. Saturday, August...
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