S 8Pack*?8 @EACT |EACT1 hf!04tH́ЁtDHX\ptЁԁ   @ ======060601 =======vConfidence Interval donfA confidence interval is a range (interval) that includes a statistical value, usually the population mean. dA cA 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. WitWhen 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. dThe 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. 2-2-Sample Z Interval calculates the confidence interval for the difference between two population means when the population standard deviations of two samples are known. 1-1-Prop Z Interval calculates the confidence interval for an unknown proportion of successes. 2-2-Prop Z Interval calculates the confidence interval for the difference between the propotion of successes in two populations. 1-1-Sample t Interval calculates the confidence interval for an unknown population mean when the population standard deviation is unknown. 2-2-Sample t Interval calculates the confidence interval for the difference between two population means when both population standard deviations are unknown. |@STAT[EXE]8Pack*?( @GUIDEDKEYLOG(NOTE@'$%xz|#There is no graphing for confidence interval functions. #General Confidence Interval Precautions Inputting a value in the range of 0C-Level<1 for the C-Level setting sets you value you input. Inputting a value in the range of 1C-Level<100 sets a value equivalent to your input divided by 100. In#Inputting a value of 100 or greater, or a negative value causes an error (Ma ERROR).