Donald’s salary last year was $65,000. The tax system says •any income under $20,000 is tax free. •Any income between $20,000 an
1 answer:
You might be interested in
Answer:
90% confidence interval: (70.41,86.89)
Step-by-step explanation:
We are given the following in the question:
Point estimate = 78.65
Margin of error, E = 8.24
Confidence level = 90%
Significance level = 10%
Formula:
Putting the values, we get,
(70.41,86.89) is the required 90% confidence interval.