The birth weights for two groups of babies were compared in a study. In one group the mothers took a zinc supplement during pregnancy. In another group, the mothers took a placebo. A sample of 165 babies in the zinc group had a mean birth weight of 3402 grams. A sample of 127 babies in the placebo group had a mean birth weight of 3027 grams. Assume the standard deviation is known to be 723 grams for the population of babies whose mothers took a zinc supplement during pregnancy and 791 grams for babies whose mothers did not. Determine the 98 % confidence interval for the true difference between the mean birth weights for "zinc" babies versus "placebo" babies. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval.

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The birth weights for two groups of babies were compared in a study. In one group the mothers took a zinc supplement during pregnancy. In
another group, the mothers took a placebo. A sample of 165 babies in the zinc group had a mean birth weight of 3402 grams. A sample of 127
babies in the placebo group had a mean birth weight of 3027 grams. Assume the standard deviation is known to be 723 grams for the population
of babies whose mothers took a zinc supplement during pregnancy and 791 grams for babies whose mothers did not. Determine the 98 %
confidence interval for the true difference between the mean birth weights for "zinc" babies versus "placebo" babies.
Step 1 of 2: Find the critical value that should be used in constructing the confidence interval.
Answer(How to Enter) 2 Points
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Transcribed Image Text:The birth weights for two groups of babies were compared in a study. In one group the mothers took a zinc supplement during pregnancy. In another group, the mothers took a placebo. A sample of 165 babies in the zinc group had a mean birth weight of 3402 grams. A sample of 127 babies in the placebo group had a mean birth weight of 3027 grams. Assume the standard deviation is known to be 723 grams for the population of babies whose mothers took a zinc supplement during pregnancy and 791 grams for babies whose mothers did not. Determine the 98 % confidence interval for the true difference between the mean birth weights for "zinc" babies versus "placebo" babies. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Answer(How to Enter) 2 Points E Keypad Keyboard Shortcuts Prev Next © 2020 Hawkes Learning MacBook Air DII DD 80 F12 F7 F6 FB F9 F10 F2 F3 F4 @ # $ & 1 3 6 7 8. { Q W E R T Y А S F G H J K C0 > C V command option option command ....
The birth weights for two groups of babies were compared in a study. In one group the mothers took a zinc supplement during pregnancy. In
another group, the mothers took a placebo. A sample of 165 babies in
zinc group had a mean birth weight of 3402 grams. A sample of 127
babies in the placebo group had a mean birth weight of 3027 grams. Assume the standard deviation is known'to be 723 grams for the population
of babies whose mothers took a zinc supplement during pregnancy and 791 grams for babies whose mothers did not. Determine the 98 %
confidence interval for the true difference between the mean birth weights for "zinc" babies versus "placebo" babies.
Step 2 of 2: Construct the 98 % confidence interval. Round your answers to the nearest whole number.
Answer(How to Enter) 2 Points
E Keypad
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Upper endpoint:
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Transcribed Image Text:The birth weights for two groups of babies were compared in a study. In one group the mothers took a zinc supplement during pregnancy. In another group, the mothers took a placebo. A sample of 165 babies in zinc group had a mean birth weight of 3402 grams. A sample of 127 babies in the placebo group had a mean birth weight of 3027 grams. Assume the standard deviation is known'to be 723 grams for the population of babies whose mothers took a zinc supplement during pregnancy and 791 grams for babies whose mothers did not. Determine the 98 % confidence interval for the true difference between the mean birth weights for "zinc" babies versus "placebo" babies. Step 2 of 2: Construct the 98 % confidence interval. Round your answers to the nearest whole number. Answer(How to Enter) 2 Points E Keypad Keyboard Shortcuts Lower endpoint: Upper endpoint: > Prev Next n.hawkeslearning.com/Portal/Test/TestTakeTest! MacBook Air 80 88 DII DD F2 F3 F4 FS F7 FB F9 F10 @ #3 $ & 1 2 3 4 5 7 8. { Q W E R Y U A S F G H J K L X C V option command command option .. .- < co B
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