¶ … statistical analysis as well as ensuring the data used is accurate, it is also essential that the appropriate statistical tools are used to undertaken in the analysis. Two similar tests are the t-test and the z-test. In both cases the test is usually applied in a situation where there is a desire to test the means of two samples, or the mean of one sample against a known mean to determine of there is a statistical difference. However, despite the similarities of the purpose of the t-test and the z-test, there are also some differences which mean that the tests are suitable for different types of situation. To appreciate when the different tests should be used, the paper will start buy looking at the z-test, and when it should be used, as well as consider the use of a t-test, which will lead to an understanding of when the less popular z-test should be used in preference to a t-test. The z-test can be used to determine if there is a statistical difference between the means of two samples, or a single sample z-test may be used where there is a known measure against which the mean can be assessed (Curwin and Slater,...
However, for the z-test to give a reliable result there are some specific requirements of the data. Firstly, it should only be used where there are sample sizes of 30 or more (Curwin and Slater, 2007). The z-test is also most suitable for data that is normally distributed. Normal distribution is seen when data for a particular phenomena being studied appears to be a bell shape on a distribution curve, as shown below. This is where the majority of the data points are towards the mean, with outliers and an equal distribution of the data towards the edges of the distribution line (Curwin and Slater, 2007). The x axis will be the measurements for the phenomena, whereas the Y axis will be the number of data points at that level, the mid point of the curve in a perfect curve will be both the mean and the median.
global warming. One of the arguments in favor of this being an issue is that temperatures have increased over time, since humans began burning fossil fuels. There are a number of ways to look at the issue, but one thing that has not received much consideration is that baseline data, which is taken from urban areas, may be skewed by other factors besides anthropogenic global warming. One factor that
SE = 2.1820749866 Hypothesis Testing Answer each question completely to recieve full credit There is a new drug that is used to treat leukemia. The following data represents the remission time in weeks for a random sample of 21 patients using the drug. State the Null Hypothesis Let XA represent the mean remission time of the new drug and XB the mean remission time of the previous drug, then the null hypothesis states that
Prison GED Programs Hypothesis testing of the effectiveness of prison GED programs in reducing recidivism The effectiveness of prison GED programs in reducing recidivism Prison GED programs The General Education Development initialized as GED is a service program of the American Council on Education. The tests in the GED are for measuring the proficiency of the persons taking the test in science, mathematics, writing, social studies and reading (Kaprov & Kaprov, 2009). When the
-Provide an example of a hypothesis where a one-tailed hypothesis test would be used. An example of a one-tailed test is testing the claim that the mean score of the gender male is higher than the scores of the gender female in public institutions. -Provide an example of a hypothesis where a two-tailed hypothesis test would be used. An example in this case is testing the claim that the mean scores between the gender male
Apple Hypothesis Testing Review Statistical Testing: Hypothesis Test The statistical analysis for this research focused on using the Z test to compare each more specified region to the national average. Thus, the data was divided into specific region, West, Midwest, Northeast, and South. Each one of these regions was then tested to the total national numbers. This helps illustrate more regional trends and how Apple should focus its marketing of its new
People Hypothesis testing There will never general agreement on the qualities that define and separate good people from bad. However when considering this topic I believed that it would be useful to look at the traits of individuals that allow them to contribute to the development of society and also to form and keep good relationships with others. In fact, it is possible that good relationships actually form the basis or
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