Answer Happy

Question 2 0/2 pts 32 Details You intend to estimate a population proportion with a confidence interval. The data suggests that the normal distribution is a reasonable approximation for the binomial distribution in this case. Find the critical value that corresponds to a confidence level of 99.5%. (Report answer accurate to three decimal places with appropriate rounding.) 2/2 = ± Question Help: Video Submit Question Question 3 If n=15, (x-bar)=42, and s-10, find the margin of error at a 90% confidence level Give your answer to two decimal places. Submit Question 0/2 pts 32 Details Question 4 0/2 pts 32 Details In a survey, 15 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $37 and standard deviation of $2. Find the margin of error at a 80% confidence level. Give your answer to two decimal places.