A manager wants to test the claim that the mean exposure to a certain type of internet ads exceeds 1000 viewers per day. After randomly selecting 22 days, she calculated the sample mean $\bar{x}$ = 1010 and standard deviation $s$ = 215.
(a) What type of distribution can the manager use to estimate probabilities?
t-distribution
z-distribution
normal distribution
binomial distribution
(b) What are the degrees of freedom? $df$ =
Use the statistical tool to answer the questions.
(c) What is the standard error of the distribution to 2 decimal places? $SE$ =
(d) Using the t-statistic calculation of $t = \frac{\bar{x} - \mu}{SE}$, find the percentage of days the manager should estimate had more than 1000 views.
Round to 2 decimal places and do not enter the % symbol.
