The table below contains the amount that a sample of nine customers spent for lunch ($) at a fast-food restaurant. Complete parts a and b below.

4.24

5.46

5.66

6.56

7.45

7.76

8.35

8.69

9.79

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Part 1

a. Construct a 95% confidence interval estimate for the population mean amount spent for lunch at a fast-food restaurant, assuming a normal distribution.

(Round to two decimal places as needed.)