The following table summarizes whether the stock market went up or down during each trading day of 2010.

(a) Use a chi-squared test to determine if these data indicate that trading on some days is better or worse (more or less likely to earn positive returns) than any other.
(b) How does the test used in €œa€ differ from comparing the proportion positive for each day with 0.5?
(c) These data only indicate the direction of the market. How does that limit the conclusions we might draw?

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Market Down 42 Direction U Day of Week Monday Tuesday Wednesday Thursday Friday 46 58 49 43 41 53 59 58