A newspaper article reported that the typical American famil

A newspaper article reported that the typical American family spent a mean average of $141.00 for Halloween items (e.g., candy, decorations, and costumes) last year. A random sample of n = 40 families this year purchased a mean of $177.00 Halloween items with a standard deviation of $82.00. Do these data indicate a significant change in holiday spending?

single sample z-test

single sample t-test

independent measures t-test

repeated measures t-test (i.e., dependent samples t-test)

2-way F (i.e., 2-way ANOVA)

Solution

the correct choice is single sample z-test

since, Z-test is preferred when standard deviation is known which is in this case