If the closing price on Thursday was 25.69...and the closing price on Wednesday went down -0.75.....then it went down -0.75 to get to 25.69.
so the closing price on Wednesday was : 25.69 + 0.75 = 26.44 <==
33.33%
Do 206/618 which is 0.3333333..
Move the decimal two places to the right.
Answer:
a) 
b)
c)
Step-by-step explanation:
Assuming the following question: Because of staffing decisions, managers of the Gibson-Marimont Hotel are interested in the variability in the number of rooms occupied per day during a particular season of the year. A sample of 20 days of operation shows a sample mean of 290 rooms occupied per day and a sample standard deviation of 30 rooms
Part a
For this case the best point of estimate for the population variance would be:

Part b
The confidence interval for the population variance is given by the following formula:
The degrees of freedom are given by:
Since the Confidence is 0.90 or 90%, the significance
and
, the critical values for this case are:
And replacing into the formula for the interval we got:
Part c
Now we just take square root on both sides of the interval and we got: