Mathematics, 27.03.2020 01:30 vaelriacb9300
What is the proportion of customers who buy service plans when they buy a computer? To find out, you surveyed 193 customers and found that 42 purchased the service plan. What is the upper boundary of 90% confidence interval for the population proportion? Use Excel and round your answer to two decimal places. Give the answer as a decimal percent (that is, for 10%, give 0.1).
Answers: 2
, and a confidence level of 
, we have the following confidence interval of proportions.
.
, z is the value of Z that has a pvalue of 
, so 
.
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