A Researcher Is Interested in Testing to Determine If the Mean

Multiple Choice

A researcher is interested in testing to determine if the mean price of a casual lunch is different in the city than it is in the suburbs. The null hypothesis is that there is no difference in the population means (i.e.the difference is zero) . The alternative hypothesis is that there is a difference (i.e.the difference is not equal to zero) . He randomly selects a sample of 9 lunch tickets from the city population resulting in a mean of $14.30 and a standard deviation of $3.40.He randomly selects a sample of 14 lunch tickets from the suburban population resulting in a mean of $11.80 and a standard deviation $2.90.He is using an alpha value of .10 to conduct this test.Assuming that the populations are normally distributed,the critical t value from the table is _______.

A) 1.323
B) 1.721
C) 1.717
D) 1.321
E) 2.321