True or False: If a residual plot shows an almost straight line then a linear model is appropriate.
A) False B) True
Q. 2A drug company wanted to test a new depression medication. The researchers found 200 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 depression symptoms decreased was recorded and compared. How many levels does the treatment in this experiment have? A) 2 (medication or placebo) B) 200 (number of respondents)
C) 1 (months of treatment) D) 10 (age span of respondents)
Q. 3The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 2400 miles.
What warranty should the company use if they want 96 of the tires to outlast the warranty? A) 55,800 mi B) 64,200 mi C) 57,600 mi D) 62,400 mi
Q. 4True or False: Residual analysis cannot be used to check for outliers.
A) False B) True
Q. 5A quiz consists of 20 multiple choice questions, each with five possible answers, only one of which is correct. If a student guesses on each question, what is the mean and standard deviation of the number of correct answers?
A) mean: 4; standard deviation: 1.78885438 B) mean: 4; standard deviation: 2
C) mean: 10; standard deviation: 1.78885438 D) mean: 10; standard deviation: 3.16227766
Q. 6A drug company wanted to test a new indigestionmedication. The researchers found 300 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 indigestion symptoms decreased was recorded and compared. What is the treatment in this experiment? A) the drug
B) the percentage who had decreased indigestion symptoms
C) the 300 adults aged 25-35
D) the one month treatment time
Q. 7A quiz consists of 100 true or false questions. If the student guesses on each question, what is the standard deviation of the number of correct answers?
A) 5 B) 0 C) 2 D) 7.07106781
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