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Questions and Answers
Which of these statements accurately describes the relationship between sample size and statistical power in hypothesis testing?
Which of these statements accurately describes the relationship between sample size and statistical power in hypothesis testing?
- Increasing the sample size increases statistical power by providing a more accurate estimate of the population parameter and reducing the margin of error. (correct)
- Sample size and statistical power are unrelated; power depends solely on the significance level and the effect size.
- Decreasing the sample size increases statistical power by amplifying the effect size.
- Increasing the sample size decreases statistical power because it reduces the likelihood of finding a statistically significant result.
A researcher is studying the effectiveness of a new drug designed to lower blood pressure. What type of error occurs if the researcher concludes that the drug is effective when, in reality, it has no effect?
A researcher is studying the effectiveness of a new drug designed to lower blood pressure. What type of error occurs if the researcher concludes that the drug is effective when, in reality, it has no effect?
- Sampling error
- Standard error
- Type I error (false positive) (correct)
- Type II error (false negative)
A study finds a statistically significant correlation of $r = -0.6$ between hours of television watched per week and GPA among college students. Which of the following is the most accurate interpretation of this result?
A study finds a statistically significant correlation of $r = -0.6$ between hours of television watched per week and GPA among college students. Which of the following is the most accurate interpretation of this result?
- There is a moderate negative relationship between TV watching and GPA; as TV time increases, GPA tends to decrease. (correct)
- Students with higher GPAs tend to watch more television.
- Watching television causes a decrease in GPA.
- 60% of the variation in GPA is explained by the amount of television watched.
In a normal distribution, approximately what percentage of the data falls within two standard deviations of the mean?
In a normal distribution, approximately what percentage of the data falls within two standard deviations of the mean?
A researcher wants to compare the average test scores of students taught using two different teaching methods. Which statistical test is most appropriate for this scenario, assuming the data meets the necessary assumptions?
A researcher wants to compare the average test scores of students taught using two different teaching methods. Which statistical test is most appropriate for this scenario, assuming the data meets the necessary assumptions?
Flashcards
Fascination with Inventions
Fascination with Inventions
New creations captivate individuals.
Ferris Wheel
Ferris Wheel
A large, rotating structure with passenger cars, designed by George Ferris.
Ferris Wheel's Appeal
Ferris Wheel's Appeal
Symbolizes innovation and progress, drawing large crowds.
Financial Success
Financial Success
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Eiffel Tower Comparison
Eiffel Tower Comparison
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Study Notes
- The detail that supports the key idea that people are fascinated by new inventions is the information about the price people paid to ride the Ferris wheel and the amount of money Ferris made.
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Description
People are fascinated by new inventions. This is supported by the amount people were willing to pay to ride the Ferris wheel and the amount of money Ferris made. This shows the public's interest in novelty.
