In a sample of 300 shoppers, 160 indicated they prefer fluoride toothpaste, 120 favored nonfluoride, and 20 were indifferent. Compute the mean and standard deviation of the sampling distribution. At a .05 level of significance, test for a difference in the preference for the two kinds of toothpaste.
What will be an ideal response?
?
| Mean = 140 |
| Standard deviation = 8.367 |
| z = 2.33; p-value = .0198; reject H0; there is a significant difference. |
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