A newspaper article reported that the typical American family spent a mean avera
ID: 3432535 • Letter: A
Question
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)
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)
Explanation / Answer
the correct choice is single sample z-test
since, Z-test is preferred when standard deviation is known which is in this case
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