As part of a study of the treatment of anemia in pre-menopause women, researchers measured the concentration of iron in the blood of 46 women that had been given a iron enriched dietary supplement for one year. All women were from the same village with same nutrition and life style (same environmental factors). The mean iron concentration was 6.35 ug/dLi and the standard deviation was 1.95 ug/dLi. Please, Calculate the Standard Error of the sample mean 0.2875 0.291 0.936 1.95 Based on the previous question description, please Calculate a 95% confidence interval of the population mean. [ 5.77, 6.93 ] [ 5.75, 6.95 ] [ 4.465, 8.235 ] [ 2.40, 10.28 ] Based on the 95% CI you got in the previous question, if we change it into calculating 99% CI of the same question, would you expect any changes on the length of the confidence intervals? wider than 95% CI The length of the 99% CI will be shorter than that of 95% CI. The length of the 99% CI will be the same as that of 95% CI. Can not determine. The length of the 99% CI will be wider than that of 95% CI. Suppose that the data in the first question on the 46 women are regarded as a pilot study, and that the researchers now wish to design a new study for which they want the standard error of the mean to be only 0.05 ug/dLi. How many women should be measured in the new study? 1521 4225 39 1522
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As part of a study of the treatment of anemia in pre-menopause women, researchers measured the concentration of iron in the blood of 46 women that had been given a iron enriched dietary supplement for one year. All women were from the same village with same nutrition and life style (same environmental factors). The mean iron concentration was 6.35 ug/dLi and the standard deviation was 1.95 ug/dLi. Please, Calculate the Standard Error of the sample mean
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0.2875
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0.291
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0.936
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1.95
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Based on the previous question description, please Calculate a 95% confidence interval of the population mean.
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[ 5.77, 6.93 ]
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[ 5.75, 6.95 ]
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[ 4.465, 8.235 ]
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[ 2.40, 10.28 ]
-
Based on the 95% CI you got in the previous question, if we change it into calculating 99% CI of the same question, would you expect any changes on the length of the confidence intervals? wider than 95% CI
-
The length of the 99% CI will be shorter than that of 95% CI.
-
The length of the 99% CI will be the same as that of 95% CI.
-
Can not determine.
-
The length of the 99% CI will be wider than that of 95% CI.
-
Suppose that the data in the first question on the 46 women are regarded as a pilot study, and that the researchers now wish to design a new study for which they want the standard error of the mean to be only 0.05 ug/dLi. How many women should be measured in the new study?
-
1521
-
4225
-
39
-
1522
-
-
-
-
-
-
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