95%? We cannot tell from the given information If a 95% confidence interval cont
ID: 3127988 • Letter: 9
Question
95%? We cannot tell from the given information If a 95% confidence interval contains 1, does that mean its 99% confidence interval contains 1? We cannot tell from the given information If a statistical test result is significant at the 0.01 level, then we can conclude: It is not significant at 0.05 level It is not significant at 0.10 level We do not know if it will be significant at 0.05 level It must be significant at 0.05 level A student hypothesized that in his class, the average weight was 120 lbs. If the 95% confidence interval of weights of all students was (90,115), can you reject the null hypothesis that the mean weight was equal to 120 lbs at 0.05 level? We cannot tell from the given information A teacher hypothesized that the on average, his students consumed two bottles of soda per day. Imagine that the teacher recorded soda consumption for every student: the confidence interval of soda consumption was (1.6,2.4). Can you reject the teacher's null hypothesis at 95%?Explanation / Answer
6. Since 120 does not fall within confidence interval, reject the null hypothesis. Therefore, the correct option is "a".
7. Since 2 falls within confidence interval, fail to reject the null hypothesis. Therefore, the correct option is "b".
8. 99% confidence interval is wider than 95% confidence interval. Therefore, the correct option is "a".
9. If p-value is less than 0.01, then only test result is significant at 0.01 level. If p-value is less than 0.01, it must be less than 0.05 too. so it must be significant at 0.05 level too. Therefore, the correct option is "d".
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