Samples of peanut butter produced by three different manufacturers were tested for salt content (in milligrams), with the following results:
Brand 1
2.5
8.3
3.1
4.7
7.5
6.3
Brand 2
4.5
3.8
5.6
7.2
3.2
2.7
Brand 3
5.3
3.5
2.4
6.8
4.2
3.0
Is there a significant difference in the mean amount of salt in these samples? Use .
a. State the null and alternative hypotheses.
b. Determine the test criteria: assumptions, level of significance, test statistic.
c. Using the information on the computer printout that follows, state the decision and conclusion to the hypothesis test.
d. What does thep-value tell you? Explain.
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