1. A professor has been teaching statistics for many years. His records show that the overall mean for the final exam is 82 with a standard deviation of 16. The professor believes that this year’s class is superior. The mean for the final exam for this year’s class of 25 students is 87. a. state the null and alternative hypotheses. b. What do you conclude using α = 0.05 2tail? c. what type of error might you be making?

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Q: How many students scored at most 90

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A: Sample sizes n= 64   Sample means X̄= 264   Sample standard deviation = 50.3

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Q: a. State the null and alternative hypothesis

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.