.
V
Passed exam
Fail
exam
Tota
A
AS
12
-
Less than 6 hours of sleep
More than 6 hours of sleep
Total
NA
Ne
92
104

ALAM
D
NOM
EL
To the nearest percent, what is the probability that a student who got less than 6 hours of sleep failed the
exam?
The probability that a student who got less than 6 hours of sleep failed the exam is |
e pro
ability that a studer
Se alled the ex
%.
D

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?