A catalog sales company promises to deliver orders placed on the Internet within 3 days. Follow-up calls to a few randomly selected customers show tha

alesterp

alesterp

Answered question

2020-12-16

A catalog sales company promises to deliver orders placed on the Internet within three business days.

Follow-up calls to a few randomly selected customers show that a 95% confidence interval for the proportion of all orders that arrive on time is 88 
a) What is the meaning of this? Are these findings accurate? Explain. 
b) 95% of all random samples of customers will show that 88% of orders arrive on time. 
c) 95% of all random samples of customers will show that 82% to 94% of orders arrive on time. 
d) We are 95% sure that between 82% and 94% of the orders placed by the sampled customers arrived on time. 
e) On 95% of the days, between 82% and 94% of the orders will arrive on time.

Answer & Explanation

Brighton

Brighton

Skilled2020-12-17Added 103 answers

a) Incorrect. This implies certainty.
b) Incorrect. Different samples will give different results. Many fewer than 95% will have 88% on-time orders.
c) Incorrect. The interval is about the population proportion, not the sample proportion in different samples.
d) Incorrect. In this sample, we know 88% arrived on time
e) Incorrect. The interval is about the parameter, not about the days.

Do you have a similar question?

Recalculate according to your conditions!

New Questions in College Statistics

Ask your question.
Get an expert answer.

Let our experts help you. Answer in as fast as 15 minutes.

Didn't find what you were looking for?