HP 39gs Instruction Manual
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HP 39gs Inference and Hypothesis Testing
Are there really 50 matches per box?
Does my data prove my theory?
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Summary of Contents for HP HP 39gs
- Page 1 HP 39gs Inference and Hypothesis Testing Are there really 50 matches per box? Does my data prove my theory?
- Page 2 HP 39gs Inference and Hypothesis Testing Are there really 50 matches per box? I A company makes boxes of matches which are supposed to contain an average of 50 matches. A student has counted the contents of 20 boxes and found the results below. Using a 5% confidence level, decide whether the company’s claim is correct.
- Page 3 HP 39gs Inference and Hypothesis Testing Once the aplet is chosen, you need to nominate the column from which to import the data. The default is column C1, which is what we want in this case. Enter the population mean of Mu = 50, and check that the test level is correct at 0.05 (5%).
- Page 4 HP 39gs Inference and Hypothesis Testing Enter the data into column C1 of the Statistics aplet. Figure 12 Changing to the Inference aplet, we choose a Hypothesis test using Z-test: 1 Mu, since we know the population standard deviation.
- Page 5 HP 39gs Inference and Hypothesis Testing In the PLOT view, we can see visually that the vertical line representing the sample mean is not within the region of rejection marked by the R->. Figure 18 From the evidence the teacher must reject the alternate hypothesis and conclude that it is not possible to say at the 5% level of significance that his class has averaged significantly higher than the standardized population from which the test was drawn.