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The above test indicates that the time differential is not significant, the temperature differential is significant, and interaction is highly significant. 20011101 u uuuuuInput Example 1-2-25 Tests (TEST) u uuuuuResults 20010101 Confidence Interval (INTR) 1-3-1 1-3 Confidence Interval (INTR) A confidence interval is a range (interval) that includes a statistical value, usually the population mean. A confidence interval that is too broad makes it difficult to get an idea of where the population value (true value) is located. A narrow confidence interval, on the other hand, limits the population value and makes it difficult to obtain reliable results. The most commonly used confidence levels are 95% and 99%. Raising the confidence level broadens the confidence interval, while lowering the confidence level narrows the confidence level, but it also increases the chance of accidently overlooking the population value. With a 95% confidence interval, for example, the population value is not included within the resulting intervals 5% of the time. When you plan to conduct a survey and then t test and Z test the data, you must also consider the sample size, confidence interval width, and confidence level. The confidence level changes in accordance with the application. 1-Sample Z Interval calculates the confidence interval for an unknown population mean when the population standard deviation is known. 2-Sample Z Interval calculates the confidence interval for the difference between two population means when the population standard deviations of two samples are known. 1-Prop Z Interval calculates the confidence interval for an unknown proportion of successes. 2-Prop Z Interval calculates the confidence interval for the difference between the propotion of successes in two populations. 1-Sample t Interval calculates the confidence interval for an unknown population mean when the population standard deviation is unknown. 2-Sample t Interval calculates the confidence interval for the difference between two population means when both population standard deviations are unknown. On the initial STAT Mode screen, press 4 (INTR) to display the confidence interval menu, which contains the following items. • 4(INTR)b(Z) ... Z intervals (p. 1-3-3) c(T) ... t intervals (p. 1-3-8) # There is no graphing for confidence interval functions. 20011101 Confidence Interval (INTR) 1-3-2 u uuuuuGeneral Confidence Interval Precautions Inputting a value in the range of 0 < C-Level < 1 for the C-Level setting sets you value you input. Inputting a value in the range of 1 < C-Level < 100 sets a value equivalent to your input divided by 100. # Inputting a value of 100 or greater, or a negative value causes an error (Ma ERROR). 20010101 k kkkkkZ Interval 1-3-3 Confidence Interval (INTR) u uuuuu1-Sample Z Interval 1-Sample Z Interval calculates the confidence interval for an unknown population mean when the population standard deviation is known. T...

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