An experiment in which neither the experimental unit nor the researcher in contact with the experimental unit knows which treatment the experimental unit is receiving is called a ________________ .
A) single-blind experiment B) randomized block design
C) matched-pairs design D) double-blind experiment
Q. 2The amount of time that customers wait in line during peak hours at one bank is normally distributed with a mean of 12 minutes and a standard deviation of 4 minutes.
The percentage of time that the waiting time is less than 14 minutes is equal to the area under the standard normal curve that lies to the ___ of ___.
A) left, -0.5 B) left, 0.5 C) right, 0.5 D) right, 0.83
Q. 3A student is asked to rate a guest speaker's ability to communicate on a scale of The student is to fill in a corresponding circle on a bubble form. This is an example of collecting what type of data?
A) insightful B) qualitative C) discrete D) continuous
Q. 4An experiment in which the experimental unit (or subject) does not know which treatment he or she is receiving is called a ________________ .
A) double-blind experiment B) randomized block design
C) matched-pairs design D) single-blind experiment
Q. 5Suppose the federal government needs to estimate the proportion of students receiving federal loans that default on those loans. Obtain a sample size that will ensure a margin of error of at most 0.006 for a 97 confidence interval.
A) 15,070 B) 130,803 C) 523,212 D) 32,701
Q. 6A manufacturer claims that fewer than 6 of its fax machines are defective. In a random sample of 100 such fax machines, 5 are defective. Find the P-value for a test of the manufacturer's claim.
A) 0.1591 B) 0.3264 C) 0.6744 D) 0.3372
Q. 7The amount of time that customers wait in line during peak hours at one bank is normally distributed with a mean of 15 minutes and a standard deviation of 3 minutes.
The percentage of time that the waiting time exceeds 16 minutes is equal to the area under the standard normal curve that lies to the ___ of ___.
A) right, -0.33 B) right, 0.33 C) left, 0.33 D) left, 0.87
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