1/26/2024 0 Comments Z score standard normal table![]() And remember a confidence interval, at a 94% confidence level means that if we were to keep doing this, and if we were to keepĬreating intervals around these statistics, so maybe But then we also wannaĬonstruct a confidence interval. ![]() This case it's a sample, a random sample of 200 computers, we take a random sample, and then we estimate this by calculating the sample proportion. We don't know what that is,īut we try to estimate it. Proportion of computers that have a defect. Remember, the whole pointīehind confidence intervals are we have some true population parameter, in this case it is the Little reminder of what a critical value is. You to pause this video, let me just give you a Star should Elena use to construct this confidence interval? So before I even ask A random sample of 200Ĭomputers shows that 12 computers have the defect. ![]() That Elena wants to build a one-sample z interval toĮstimate what proportion of computers produced at aįactory have a certain defect. ![]()
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