answer questions only condo in 2700. within Find ation was the minimum sample si

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condo in 2700. within Find ation was the minimum sample size needed for this estimate. 2. Thirty randomly selected people were asked how long they slept at night. (0pts) The mean time was 6 hours, and the standard deviation of the sample was 0.5 is hour. Find the 99% confidence interval of the mean time. Assume the variable normally distributed. Interpret the interval. 3. Arandom sample of 50 Roman Catholic Church parishes had a mean size of 2600 members. Assume that the population standard deviation is 1000

Explanation / Answer

2) here std error of mean =std deviation/(n)1/2 =0.5/(30)1/2 =0.0913

for 29 degree of freedom and 99% CI, t=2.7564

hence 99% Confidence interval =sample mean -/+ t*Std error =5.7484 ; 6.2516

above interval provide 99% confidence to contain true mean sleep time of population at night

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