A salesperson found that there was a 1 chance of a sale from her phone solicitations. Find the probability of getting 5 or more sales for 1000 telephone calls. Round the standard deviation to three decimal places to work the problem.
A) 0.9599 B) 0.0401 C) 0.8810 D) 0.0871
Q. 2A jury is to be selected from a pool of 34 potential jurors. The defendant faces the death penalty if convicted. Of the potential jurors, 7 are opposed to the death penalty. The jury consists of 12 randomly selected jurors.
The random variable X represents the number of jurors who oppose the death penalty. A) hypergeometric; N = 34, n = 12, k = 7, x = 0, 1, 2, . . . , 7
B) hypergeometric; N = 34, n = 7, k = 12, x = 0, 1, 2, . . . , 7
C) hypergeometric; N = 34, n = 12, k = 7, x = 0, 1, 2, . . . ,12
D) not hypergeometric
Q. 3A drug company wanted to test a new arthritis medication. The researchers found 500 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. Identify the experimental units. A) the 500 adults aged 25-35
B) the percentage who had decreased arthritis symptoms
C) the drug (medication or placebo)
D) the one month treatment time
Q. 4True or False: For two events A and B, suppose P(A ) = 0.1, P(B) = 0.8, and P(AB) = 0.1. Then A and B are independent.
A) True B) False
Q. 5A drug company wanted to test a new arthritis medication. 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 arthritis symptoms decreased was recorded and compared. What type of experimental design is this? A) completely randomized design B) randomized block design
C) matched-pairs design D) single-blind design
Q. 6True or False: For two events A and B, suppose P(A ) = 0.35, P(B) = 0.65, and P(BA ) = 0.35. Then A and B are independent.
A) False B) True
Q. 7In a chi-square test of homogeneity of proportions we test the claims that
A) different populations have the same proportions of individuals with the same characteristics.
B) across a single sample the proportion of individuals with the same characteristic is the same as the
population.
C) the proportion of individuals with a given characteristic doesnt change over time.
D) the proportion of a population having a given characteristic is based on the homogeneity of the
population.
Q. 8To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine found in all commercial brands of cigarettes. A new cigarette has recently been marketed.
The FDA tests on this cigarette gave a mean nicotine content of 28.4 milligrams and standard deviation of 2.6 milligrams for a sample of n = 9 cigarettes. The FDA claims that the mean nicotine content exceeds 31.0 milligrams for this brand of cigarette, and their stated reliability is 90. Do you agree? A) No, since the value 31.0 does not fall in the 90 confidence interval.
B) Yes, since the value 31.0 does fall in the 90 confidence interval.
C) Yes, since the value 31.0 does not fall in the 90 confidence interval.
D) No, since the value 31.0 does fall in the 90 confidence interval.
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