A student scores 74 on a geography test and 249 on a mathematics test. The geography test has a mean of 80 and a standard deviation of 5. The mathematics test has a mean of 300 and a standard deviation of 34.
If the data for both tests are normally distributed, on which test did the student score better relative to the other students in each class?
A) The student scored better on the mathematics test.
B) The student scored better on the geography test.
C) The student scored the same on both tests.
Q. 2Jim buys his school supplies in bulk. On one particular shopping trip he bought 5 red pens at 1.29 each, 3 blue pens at 1.49 each, 6 green pens at 1.79 each and 9 black pens at 0.99 each. What was the average cost of a pen?
A) 1.39 B) 1.33 C) 1.29 D) 0.99
Q. 3A medical journal published the results of an experiment on insomnia. The experiment investigated the effects of a controversial new therapy for insomnia.
Researchers measured the insomnia levels of 58 adult women who suffer moderate conditions of the disorder. After the therapy, the researchers again measured the women's insomnia levels. The differences between the the pre- and post-therapy insomnia levels were reported. What is the treatment in this experiment?
A) the disorder (insomnia or no insomnia)
B) the therapy
C) the 58 adult women who suffer from insomnia
D) the differences between the the pre- and post-therapy insomnia levels
Q. 4In a health food store, Jenny and Kevin create a trail mix from dried fruit, nuts, and granola. They buy 4 pounds of dried fruit at 3.00 per pound, 3 pounds of nuts at 4.50 per pound, and 5 pounds of granola at 5.00 per pound.
Determine the cost per pound of the mix.
A) 4.33 B) 4.21 C) 4.04 D) 4.41
Q. 5A medical journal published the results of an experiment on depression. The experiment investigated the effects of a controversial new therapy for depression.
Researchers measured the depression levels of 41 adult women who suffer moderate conditions of the disorder. After the therapy, the researchers again measured the women's depression levels. The differences between the the and depression levels were reported. What is the response variable in this experiment?
A) the differences between the the pre- and post-therapy depression levels
B) the 41 adult women who suffer from depression
C) the therapy
D) the disorder (depression or no depression)
Q. 6A student receives test scores of 62, 83, and 91. The student's term project score is 88 and her homework score is 76.
Each test is worth 20 of the final grade, the term project is 25 of the final grade, and the homework grade is 15 of the final grade. What is the student's mean score in the class?
A) 83.3 B) 76.6 C) 80.0 D) 80.6
Q. 7A drug company wanted to test a new acne medication. The researchers found 300 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 300 adults aged 25-35
C) the percentage who had decreased acne symptoms
D) the one month treatment time
Quick Reply
