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1.Reported Versus Measured In a survey of 1046 adults conducted by Bradley Corporation, subjects were asked how often they wash their hands when using a public restroom, and 70% of the respondents said "always."
a. Identify the sample and the population.
b. Why would better results be obtained by observing the hand washing instead of asking about it?
2. Statistical Significance Versus Practical Significance When testing a new treatment, what is the difference between statistical significance and practical significance? Can a treatment have statistical significance, but not practical significance?
3. Correlation One study showed that for a recent period of 11 years, there was a strong correlation (or association) between the numbers of people who drowned in swimming pools and the amounts of power generated by nuclear power plants (based on data from the Centers for Disease Control and Prevention and the Department of Energy). Does this imply that increasing power from nuclear power plants is the cause of more deaths in swimming pools? Why or why not?
Suppose that hwrte (percentage of homework turned in) is positively correlated with atndrte and has a direct positive effect on stndfnl. What would happen to the estimated coefficient of atndrte if hwrte were added into the above regression?
Repeatedly click the "Sample 50" button until you have 1000 intervals. Report the percent hit for your 1000 intervals.
Center and Variation When you are comparing two sets of data, and one set is strongly skewed and the other is symmetric.
A researcher plans to conduct an experiment evaluating the effect of a treatment. A sample of n=9 participants is selected and each person receives the treatment before being tested on a standardized dexterity task. The treatment is expected to lo..
consider the following joint discrete probability mass function pmfpxy 0.1 for xy 11 21 12 and 220.2
Records also point to that interviewing committee of bank officers approves 85% of individuals they interview. Determine probability that Ann's loan request is approved.
a company has estimated that a proposed 10000 investment will generate 3250 for each of the next four years. their
What conclusion can be derived by comparing the central tendencies of the two data sets?
Compute the conservative margin of error for this poll based on those likely to vote, and compare it to the precise margin of error presented.
When n = 250, determine the probability that proportion of couples in sample who are racially or ethnically mixed will be greater than 0.07?
determine the area under the standard normal curve that lies to the left of a z-1.03 b z-1.42 c z-0.77 and d
If the speed of lights is 3.00x 10 to the power of 8 m/sec, how long does it take light to travel 2.29x 10 to the power of 11 m, the distance from the sun to Mars? Round to one decimal place.
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