An e-business manager wants to test the claim that the mean exposure to a certain type of internet ads exceeds 1100 viewers per day. Randomly selecting 50 days she calculated the sample mean and standard deviation. As far as the population standard deviation is not available, but the population is approximately normally distributed she has to use a

• Chi-Square (
• 2
• 2
• )distribution
• Binomialdistribution
• Student (t)distribution
• Fdistribution
• Normal (z)distribution
• None of the above.