This is evident by the fact that the data fall along a straight line. The assumption of normality should be satisfied in order to perform a hypothesis test using a c 2 test statistic. The parameter of interest is the standard deviation, s . Although the sample proportion is less than the hypothesized value of 0.01, it is not significantly less than 0.01 to conclude that the proportion is at less than 0.01. The value of 0.0067 could have occurred as a result of sampling variation.
Preliminary information can significantly decrease the computed needed sample size.
Higher confidence always yields larger intervals, all other values held constant. Yes, since both intervals contain the value 0.25, thus the true proportion cannot be considered significantly different from 0.25. The value of p must be estimated. The variable of interest is the form of the distribution for the number of nonconforming coil springs. 14.07 reject H 0 .