7. A company manufactures shaving sets for $5 each and sells them for $7 each. How many shaving sets must be sold for the
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The range of the answer is [-3,infinity) and {yly>=-3}
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