A group of researchers would like to see whether people are more likely to adhere to the Mediterranean diet if they attend a weekly workshop on the Mediterranean diet than if they are given a Mediterranean diet cookbook. To recruit study participants, they host a website offering a free diet intervention to anyone who signs up. From the online signup list, they randomly select 40 people to take the course and 40 to receive the cookbook. Of the 40 people who took the course, 3 months later, 55% report still adhering to the Mediterranean diet. Of the 40 who received the cookbook, 3 months later, 45% report adhering to the diet. What is the parameter of interest in this study? Let pˆwkshp be the proportion of individuals adhering to the diet 3 months later among individuals who have completed the workshop and let pcook be the proportion of individuals adhering to the diet 3 months later among those who received the cookbook. Calculate a 90% confidence interval for pwkshp − pcook. Now calculate a 90% confidence interval for pcook −pwkshp. What stays the same and what changes from what you obtained in part (b)?
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
A group of researchers would like to see whether people are more likely to adhere to the Mediterranean diet if they attend a weekly workshop on the Mediterranean diet than if they are given a Mediterranean diet cookbook. To recruit study participants, they host a website offering a free diet intervention to anyone who signs up.
From the online signup list, they randomly select 40 people to take the course and 40 to receive the cookbook.
Of the 40 people who took the course, 3 months later, 55% report still adhering to the Mediterranean diet.
Of the 40 who received the cookbook, 3 months later, 45% report adhering to the diet.
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What is the parameter of interest in this study?
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Let pˆwkshp be the proportion of individuals adhering to the diet 3 months later among individuals who have completed the workshop and let pcook be the proportion of individuals adhering to the diet 3 months later among those who received the cookbook. Calculate a 90% confidence interval for pwkshp − pcook.
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Now calculate a 90% confidence interval for pcook −pwkshp. What stays the same and what changes from what you obtained in part (b)?
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