1.A company manufactures batteries in batches of 11 and there is a 3% rate of defects. Find the standard deviation for the number of defects per batch.

2 Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05.

r = 0.893, n = 9

Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation . Assume that the population has a normal distribution. Round the confidence interval limits to the same number of decimal places as the sample standard deviation.

Weights of eggs: 95% confidence; n = 22,= 1.65 oz, s = 0.47 oz

Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation . Assume that the population has a normal distribution. Round the confidence interval limits to one more decimal place than is used for the original set of data.

The daily intakes of milk (in ounces) for ten randomly selected people were:

23.3 28.4 10.5 16.4 26.4

18.1 20.4 17.3 27.4 13.2

Find a 99% confidence interval for the population standard deviation .