Find the z-score for which the area under the standard normal curve to its left is 0.04
A) -1.89 B) -1.48 C) -1.63 D) -1.75
Q. 2A drug company wanted to test a new acne medication. The researchers found 800 adults aged and randomly assigned them to two groups. The first group received the new drug, while the second received a placebo.
After one month of treatment, the percentage of each group whose acne symptoms decreased was recorded and compared. Identify the experimental units.
A) the drug (medication or placebo)
B) the 800 adults aged 25-35
C) the percentage who had decreased acne symptoms
D) the one month treatment time
Q. 3Suppose a brewery has a filling machine that fills 12 ounce bottles of beer. It is known that the amount of beer poured by this filling machine follows a normal distribution with a mean of 12.14 onces and a standard deviation of 0.04 ounce.
Find the probability that the bottle contains more than 12.14 ounces of beer.
A) 1 B) 0.5 C) 0.4 D) 0
Q. 4Find the z-score having area 0.09 to its left under the standard normal curve.
A) -1.45 B) -1.39 C) -1.34 D) -1.26
Q. 5In a health food store, Jenny and Kevin create a trail mix from dried fruit, nuts, and granola. They buy 5 pounds of dried fruit at 3.50 per pound, 2 pounds of nuts at 4.50 per pound, and 4 pounds of granola at 5.00 per pound.
Determine the cost per pound of the mix.
A) 3.58 B) 4.23 C) 4.35 D) 4.43
Q. 6A drug company wanted to test a new arthritis medication. The researchers found 800 adults aged 25-35 and randomly assigned them to two groups. The first group received the new drug, while the second received a placebo.
After one month of treatment, the percentage of each group whose arthritis symptoms decreased was recorded and compared. What type of experimental design is this?
A) completely randomized design B) matched-pairs design
C) randomized block design D) single-blind design
Q. 7Find the z-score for which the area under the standard normal curve to its left is 0.40
A) -0.25 B) -0.57 C) 0.25 D) 0.57
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