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An advertising agency is judged by the increase in the proportion of people who buy a particular product after the advertising campaign is conducted. In a random sample of 200 people prior to the campaign, 40 said that they prefer the product in question. After the advertising campaign, out of a random sample of 300, 80 say they prefer the product.
(a) Find a 90% confidence interval for the difference in the proportion of people who prefer the stipulated product before and after the advertising campaign.
(b) Can you conclude that the advertising campaign has been successful in increasing the proportion of people who prefer the product? Use a level of significance of 0.10.
several population studies have demonstrated an inverse correlation of the rate of sudden infant death syndrome sids
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Based on the expected return, would you rather invest your money in the stock market or in gold? Why?
a polling company obtains an alphabetical list of names of voters in a precinct. they select every 20th person from
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Which of the following exam scores should lead to the better grade?
They kept track of the mother s age, the number of weeks the pregnancy lasted, the type of birth the level of prenatal care the mother had, the birth weight and sex of the baby, and whether the baby exhibited health problems.
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According to the leadership literature, there are a number of different leadership styles. Listed below are scores obtained from an instrument designed to measure a particular leadership style, which will be referred to as style X.
The test scores of 6 randomly picked students and the numbers of hours they prepared are as follows: The equation of the regression line is y(^on top)=1.06604x+67.3491. Find the coefficient of determination.
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