# confidence interval

1. ### How can I find an interval estimate for the mean of a Weibull distribution?

I have a sample of n = 75 taken from a Weibull distribution and have computed mle estimates for the scale a and shape b parameter. The mean of a Weibull distribution (2 parameter) is given as u = a^(-1/b)*gamma(1+ 1/b) In which case I can find an estimate for u by simply plugging in the mle...

16. ### Overlapping confidence intervals

Say I have a calculation model, calculating the a mean (lets say 36) value (with +-2 95% CI) as uncertainty for the calculation result. Then I measure the value 6 times, to a mean of 33 with (+1.5 95% CI), so the CI overlaps by .5 I want to say something about the compliance...
17. ### Can someone please check my answers? It's over confidence intervals

This isn't techinally homework. It's extra practice questions giving by my teacher. I just want to make sure I'm understanding everything correctly. If I have a question wrong, can you please give me the right answer and explain it in great detail? 1. Construct a 95 percent confidence...
18. ### Measuring the effect of in-store Promotions

Hello, I am testing the effect of a new in-store promotion technique (treatment). It is applied during product promotions, as a compliment to regular promo displays, to further improve sales. I have the treatment in only one store but on several products promotions in that store (I have...
19. ### Help with figuring out confidence interval level

Hello. My group was conducting a statistics study and we had all our data in an Excel file. We held a pretest (asked survey to nonmembers of the population but had the same characteristics). The results that we got from there was what helped us determine the needed sample size from the actual...
20. ### Confidence interval: true or false?

We have measured the concentration cesium-137 in the tissue of 15 tunafish. We may consider the distribution as normal distribution and a 95 % Confidence Interval for the mean concentration was calculated to (5.03 to 6.71) (Bq/kg). Is the following statement true or false: "The interval means...