Construct 90 95 and 99 confidence intervals to estimate fro

Construct 90%, 95%, and 99% confidence intervals to estimate ? from the following data. State the point estimate. Assume the data come from a normally distributed population.

12.0 11.6 11.9 11.9 12.5 11.4 12.0 11.7 11.8 12.0

*Round your answer to 2 decimal places, the tolerance is +/-0.05. **Round the intermediate values to 4 decimal places. Round your answers to 2 decimal places, the tolerance is +/-.

Use the following data to construct 90% and 95% confidence intervals to estimate the population variance. Assume the data come from a normally distributed population.

Round the intermediate values to 4 decimal places. Round your answers to 3 decimal places, the tolerance is +/-0.005.

90% confidence interval ----------? ?² ?------------

95% confidence interval:----------? ?² ?------------

Solution

1) First let us find the mean of the given data and also std dev

Mean =11.9 and stddev = 0.30414 and n = 9

Confidence Interval:90%