Answer: 1.303639
Step-by-step explanation:
The t-score for a level of confidence
is given by :_
, where df is the degree of freedom and
is the significance level.
Given : Level of significance : 
Then , significance level : 
Sample size : 
Then , the degree of freedom for t-distribution: 
Using the normal t-distribution table, we have

Thus, the t-score should be used to find the 80% confidence interval for the population mean =1.303639
Answer:
cos theta = 4/5
Step-by-step explanation:
Since this is a right triangle
Cos theta = opp side/ hypotenuse
Cos theta = 8/10
cos theta = 4/5
Answer:
Sub to XxDuckyxX it has 225
Step-by-step explanation:
<u>The answer is C</u>. This is because the square of 8 is 64 and the square of 9 is 81. The only number in between those choices is C; 71.
Hope this helps :)
(mind giving me brainliest answer? it helps!)