Author Question: When calculating a confidence interval, the reason for using the t-distribution rather than the ... (Read 88 times)

cartlidgeashley · **on:** Jun 24, 2018

When calculating a confidence interval, the reason for using the t-distribution rather than the normal distribution for the critical value is that the population standard deviation is unknown.

Indicate whether the statement is true or false

Question 2

Assuming that the change in daily closing prices for stocks on the New York Stock Exchange is a random variable that is normally distributed with a mean of .35 and a standard deviation of .33.

Based on this information, what is the probability that a randomly selected stock will close up .75 or more?A) 0.3869
B) 0.1131
C) 0.7100
D) 0.8869