Homework Answers
1.
The smaller the p-value, the stronger the evidence that you should reject the null hypothesis.
A p-value less than 0.05 (typically ≤ 0.05) is statistically significant. It indicates strong evidence against the null hypothesis, as there is less than a 5% probability the null is correct (and the results are random).
Researcher B has a p-value of 0.04, which will be more significant than p-value of 0.08.
Option A is the right answer.
2.
A p-value less than 0.05 (typically ≤ 0.05) is statistically significant. It indicates strong evidence against the null hypothesis, as there is less than a 5% probability the null is correct (and the results are random).
3.
More the confidence interval, wider is the confidence interval width.
If it is increased to 98, then the width would be wider.
Option C is the right answer.
4.
Increasing the sample size decreases the width of confidence intervals, because it decreases the standard error.
Hence, Option D is the right answer.
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