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Confidence Intervals" (Note: Please respond to one [1] of the following two [2] bulleted items)•The vast majority of the world uses a 95% confidence in building confidence intervals. Give your opinion on why 95% confidence is so commonplace. Justify your response.•Construct a hypothetical 95% confidence interval for a hypothetical case of your choosing. Use your own unique choice of mean, standard deviation, and sample size to calculate the confidence interval. Select one (1) option provided below and analyze what will happen to your confidence interval based on the option you selected: ?The confidence changes to 90%.?The confidence changes to 99%.?The sample size is cut in half.?The sample size is doubled.?The sample size is tripled.
Construct a 90% confidence interval for the population proportion, p, in order to test the claim from a confidence interval point of view. What is the best point estimate for p?
List one unclear concept regarding regression and provide an example from your personal or work life where regression could be used to show a relationship between two variables.
What is 95% confidence interval estimate for average number of years served by all Supreme Court justices?
All the pupils took the same achievement test, and the means for groups receiving different methods were compared. What was the dependent variable?
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
Think of a case in which regression analysis was used, but not properly. For instance, discuss situations in which regression analysis is not appropriate and does not add useful information to our understanding of a set of data.
Is there solid evidence that the earth is getting warming? 69% of 731 male resondents answered yes and 70% of 770 female respondents answered yes.
Those who have quit smoking often return to the habit. The authors of a paper concluded that forbidding smoking in the smoker's residence was a significant predictor of the ability to abstain from smoking.
In playing the Lemonade Stand Game, Bob decreased his price per cup by two cents, from $.27 per cup to $.25 per cup. At the .05 level of significance, did net revenue increase?
The sample mean X will be used to estimate. Determine the probability that the estimate will be off by less than .2 oz. Assume that the SD of the fills is .8 oz.
The mean top of knee height of a sitting mate is 20.7 in.
What percent of batteries have a life span that is more than 2560 hours? Would it be unusual for a battery to have a life span that is more than 2560 hours? Explain your reasoning
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