(c) If the confidence levels were 80% rather than 90%, would the margin of error be larger or smaller than the result in part (a)? Explain. The margin of error would be (choose one) V , since (choose one) V in the confidence level will (choose one) V - the critical value 20/2. How many computers? In a simple random sample of 170 households, the sample mean number of personal computers was 1.55. Assume the population standard deviation is 6=0.7. (a) Construct a 90% condence interval for the mean number of personal computers. Round the answer to at least two decimal places. A 90% condence interval for the mean number of personal computers is