Choose the one alternative that best completes the statement or answers the ques
ID: 3228360 • Letter: C
Question
Choose the one alternative that best completes the statement or answers the question. Provide an appropriate response. Ina survey of 1,000 television viewers, 40% said they watch network news programs. For a 99% confidence level the margin of error for this estimate is 3.99%. If we only want to be 90% confident, how will the margin of error change? A) Since less confidence allows a narrower interval the margin of error will be larger. B) the margin of error will remain the same. C) Since less confidence allows a narrower Interval, the margin of error will be smaller. D) Since less confidence allows a wider Interval, the margin of error will be larger. E) Since less confidence allows a wider interval the margin of error will be smaller. Write the word or phrase that best completes each statement or answers the question. You work for a credit card company. You are assigned to estimate the proportion of the accounts in which a customer applied for and received a card but never used it. For a random sample of 20 customers. 3 never used it. Find and interpret a 95% confidence interval for the population proportion. Can you conclude that fewer than half the people who received the credit card never used it?Explanation / Answer
1) answer is C
Margin of error is calculated by multiplying the Z multiplier with the standard error For greater confidence level the value of Z increases hence answer is part C.