Hi, can I get some help with the following problem? The text book solution on th

Question

Hi, can I get some help with the following problem? The text book solution on the Cramster site doesn't have a solution to part d. I have the solutions to part a, b, and c. I just need help with part d, if possible. (Textbook: Statistics by Freedman, 3rd edition). Thank you!

With a perfectly balanced roulette wheel, in the long run, red numbers should turn up 18 times in 38. To test its wheel, one casino records the results of 3,800 plays, finding 1890 red numbers. Is that too many reds? Or chance variation?

a. Formulate the null and alternative hypothesis as statements about a box model.
b. The null says that the percentage of reds in the box is _____. The alternative says that the percentage of reds in the box is _____. Fill in the blanks.
c. Compute z and P
d. Were there to many reds?

Explanation / Answer

To determine if there are too many reds (reject the null hypothesis that there aren't) you need to know what your alpha (level of significance) is. You then compare the p value (which you said you had) with that level. If the p value is smaller then there are too many reds and you reject the null hypothesis that there aren't. If they don't give you an alpha level it is usually .05. But they should tell you what it is somewhere in the problem.

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