The file contains the amount that a sample of fifteen customers spent for lunch ($) at a fast-food restaurant:

a. At the 0.05 level of significance, is there evidence that the mean amount spent for lunch is different from $6.50?
b. Determine the p-value in (a) and interpret its meaning.
c. What assumption must you make about the population distribution in order to conduct the t test in (a) and (b)?
d. Because the sample size is 15, do you need to be concerned about the shape of the population distribution when conducting the t test in (a)? Explain.

Transcribed Image Text:

7.42 6.29 5.83 6.50 8.34 9.51 7.10 6.80 5.90 4.89 6.50 5.52 7.90 8.30 9.60