Homework 07_ Common Mistakes.pdf - Data 8 Summer 2018 Homework 07 Question Summary Answer Summary Common Mistakes 1.2 Null and Alternative for customer

Homework 07_ Common Mistakes.pdf - Data 8 Summer 2018...

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Data 8 Summer 2018 Homework 07 Question Summary Answer Summary Common Mistakes 1.2 Null and Alternative for customer who got 13 heads in 20 tosses Null: Customer had 50% chance of winning each bet Alternative: Customer had more than 50% chance of winning each bet No common mistakes 1.6 Histogram of the empirical distribution of the number of wins in 20 games Many students ran the simulation properly but did not set the bins to be representative of the distribution. The bins should have a width of one. 1.8 Using a p-value cutoff of 1%, what do you conclude? Correct conclusion based on the p-value you got. Correct explanation for comparing p-value with .01 Many students said that we “reject the alternative hypothesis” when our p-value is greater than 0.01. We should instead be saying that we fail to reject the null, since disproving the null is the point of running a hypothesis test. Some students only said what they would conclude using the p-value cutoff without referencing that actual p-value that was calculated. Some students mistook a 1% p-value cutoff for 0.1 instead of 0.01. 1.9 Is p-value the probability that the customer cheated? No, the p-value is not the probability that any hypothesis is correct.
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  • Fall '17
  • Null hypothesis, Statistical hypothesis testing, 1%, 50%, representative, 20%

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