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Q1) Sample size of 31 is utilized to test Ho:u=50 vs Ha:u is not equal 50
Given mean x=48.2 and std=5.1
i) Determine the calculated value of the test statistic?
ii) What distribution does test statistic have when null hypothesis is true?
iii) Is alternative hypothesis one-tailed or two-tailed?
iv) What is the p-value?
Q2) Researcher is interested in evaluating noise levels in decibels at area urban hospitals. She wishes to be 99% confident that her estimate is right. If standard deviation is 4.8, how large a sample is required to get desired information to be correct within 0.60 decibels? Illustrate all work.
Mean and standard deviation are 584.6 and 34.28
Concept of statistical signi cance
A sample of 50 provided a sample mean of 14.15. The population standard deviation is 3.
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