We wish to give a 90% confidence interval for the mean value of a normally distributed random variable. we obtain a simple random sample of 9 elements from the population on which the variable is defined. the sample has a mean value of 10.2 and a sample standard deviation 1.5. find the 90% confidence interval for the mean value.

Step-by-step explanation:

Given : Sample size : n= 9

Degree of freedom = df =n-1 =8

Sample mean :

sample standard deviation :

Significance level ;

Since population standard deviation is not given , so we use t- test.

Using t-distribution table , we have

Critical value =

Confidence interval for the population mean :

90% confidence interval for the mean value will be :

Hence, the 90% confidence interval for the mean value=

don't know sorry bru

step-by-step explanation:

the central idea is that:

individuals should refuse to cooperate with institutions they believe unjust.

thoreau felt  that governments were more often agents of corruption than justice, even democracies, and that just because the majority feels a certain way does not make it just or correct in absolute terms. he uses the fact that slavery exists in our democracy to support this idea.

he goes on to say that, as a result, people should live true to their own internal laws regarding right and wrong, as a product of reflection and a moral life, rather than following every law that society imposes. 

step-by-step explanation: