n a health survey of 1020 adults in the US, 44% said that they wash their hands after riding public transportation (based on data from KRC Research, http://www.krcresearch.com). What is the population of interest? What is the sample? Is the value 44% a parameter or statistic?
Problem 1
In a health survey of 1020 adults in the US, 44% said that they wash their hands after riding public transportation (based on data from KRC Research, http://www.krcresearch.com).
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- What is the population of interest?
- What is the sample?
- Is the value 44% a parameter or statistic?
- What is the level of measurement of the value 44%?
- Are the numbers of subjects in such surveys discrete or continuous?
Problem 2
The Financial Times/Harris Poll is a monthly online poll of adults from six countries in Europe and the United States. A January poll included 1020 adults in the United States. One of the questions asked was, “How would you rate the federal bank in handling the credit problems in the financial markets?” Possible responses were Excellent, Good, Fair, Bad, and Terrible (Harris Interactive website, January 2008).
- What was the sample for this survey?
- Are the data qualitative or quantitative?
- Of the respondents in the United States, 10% said the Federal Bank is doing a good job. How many individuals provided this response?
Problem 3
A study was conducted in which 20,211 18-year-old Israeli male military recruits were given an exam to measure IQ. In addition, the recruits were asked to disclose their smoking status. An individual was considered a smoker if he smoked at least one cigarette per day. The goal of the study was to determine whether adolescents aged 18 to 21 who smoke have a lower IQ than nonsmokers. It was found that the average IQ of the smokers was 94, while the average IQ of the nonsmokers was 101. The researchers concluded that lower IQ individuals are more likely to choose to smoke, not that smoking makes people less intelligent.
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- What is the research objective?
- What is the population being studied?
- What is the sample?
- What are the
descriptive statistics ? - What are the conclusions of the study
Problem 4
The Investa-X Organization conducted a survey of 1025 adults, aged 18 and older, living in the Philippines and asked “If you had twenty-thousand pesos to spend, do you think investing it in the stock market would be a good or bad idea?” Of the 1025 adults, 48% said it would be a bad idea. The organization reported that 48% of all adults, aged 18 and older, living in the Philippines thought it was a bad idea to invest Php20,000 in the stock market with a 4% margin of error at 95% confidence level.
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- What is the research/survey objective?
- What is the population?
- What is the sample?
- What are the descriptive statistics?
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Problem 5
To predict the outcome of a regional (local) election, a social media outlet obtains a list of all 235,015 registered voters in the region and wants to take a systematic sample.
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- Determine k if the sample size is 735.
- If the random start is at person 57, determine the sequence of individuals who will be administered the survey (you may list the first 15 respondents).
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