# Question: Groton Boat Supply has received shipments of 15 000 pressurized cans

Groton Boat Supply has received shipments of 15,000 pressurized cans of fiberglass sealant from each of its two main suppliers, Alcott Industries and Brookside, Inc. Inspectors at Groton take a simple random sample of 150 of the cans from the Alcott shipment and find that 15 are under pressurized. For a similar sample of 150 components from the Brookside shipment, nine of the cans are under pressurized. Construct and interpret the appropriate 95% confidence interval estimate of the overall difference in the proportion of under pressurized cans for the two shipments.

## Relevant Questions

Soho Paint set up a market test in two separate regions of the country to examine the effects of a new wholesale pricing policy. A sample of 100 industrial customers was randomly selected from the Northeast region. ...Refer to Exercise 97. Assume the cleanliness readings were produced from two independent samples rather than from matched samples. Use the independent samples approach to produce a 95% confidence interval estimate of the ...The competing hypotheses for a particular hypothesis test are as follows: H0: μ > 2500 seconds Ha: μ < 2500 seconds Assume the population standard deviation is known to be 140 seconds and that you intend to take a random ...The competing hypotheses for a hypothesis test are as follows: H0: μ > 500 Ha: μ < 500 Assume the population standard deviation is known to be 36. A random sample of size 81 has a sample mean of 488. a. Calculate the p ...The competing hypotheses for a hypothesis test are as follows: H0: There is no heaven or hell. Ha: There is a heaven and hell. a. Describe what a Type I error would be here. b. Describe what a Type II error would be here. ...Post your question