Step 1 Given mean wake time of 22 subjects before treatment is 103 minutes. After treatment 22 subjects have mean wake time 79.9 minutes and standard deviation 20.3 minutes and normally distributed. The Z critical score for 90% donfidence interval is calculated with reference to below shown table. The Z score for probability value 0.9495 is 1.64 and Z score for probability value 0.9505 is 1.65. So on average the Z score of 0.95 probability is 1.645.

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Q: For each data example, identify whether it is qualitative, quantitative discrete, or quantitative…

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Q: A survey conducted on a certain website indicated that 52.9% of the people visiting this website…

A:

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A:

Q: Express the confidence interval (48.7 % , 58.5 % ) in the form of p ± E.

A: Given information confidence interval (48.7%,58.5%)

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Q: d their candidate. State your answers as percents rounded to 1 decim

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A:

Q: Is the proportion of all people who went trick or treating who received fruit in addition to candy…

A: based on the calculation in question 9, we can say with 95% confidence that the true proportion of…

Q: A study at Harvard found that 44% of their students binge drink. You are at Princeton doing a…

A:

Q: The confidence interval at the 95% confidence level for mu(u) was reported to be (69.7, 90.3). Which…

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Q: In a survey 2 of 1000 US adults, 20% say they never exercise. Construct a 99% confidence interval…

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Q: What is the effect on the size of the confidence interval if a T score is used instead of a Z score?…

A: The formula for calculating confidence interval using Z score is as follow:

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Q: What are the z-scores for 90%, 95%, and 99% confidence?

A: the z-scores for 90%, 95%, and 99% confidence

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.