Question

Researchers did a study to compare how much people in their teens (13–19 years old) and twenties (20–29 years old) talk in a day. It is commonly thought that teenagers talk more than older people. The study collected data from a simple random sample of teenagers and a simple random sample of people in their twenties. For each individual in these samples the researchers gave the estimated number of words spoken in a day.

(a) Do the data provide good evidence that teenagers talk more than people in their twenties, on average? State the null and alternative hypotheses relative to this question.

(b) Find the t test statistic. Excel formula please!

(c) What is the P-value for your t? Excel formula please!

(d) Do the data support the researchers’ idea?

ages 13-19 --> 1st X bar=1496.11111 STDEV=7914.34 N=27

ages 20-29 --> 2nd X bar= 12866.7 STDEV:8342.472 N=20

Answer 1