Terms in this set (61)
Quiz____?
Graphs of normal distributions -
Answer✓✓
always have the same characteristic bell shape
Quiz____?
In a normal distribution, the mean -
Answer✓✓
is equal to the median
Quiz____?
In a normal distribution, data values farther from the mean are -
Answer✓✓
less common than data values close to the mean
1
, Quiz____?
Consider wages at a fast food restaurant where most of the workers earn the minimum wage.
Would you expect the wages of all workers at this restaurant to have a normal distribution? -
Answer✓✓
no, because a normal distribution is symmetric, but no one earns less than the minimum wage
Quiz____?
In a normal distribution, about two-thirds of the data values fall within -
Answer✓✓
1 standard deviation of the mean
Quiz____?
Suppose a car driven under different conditions gets a mean gas mileage of 40 miles per gallon
with a standard deviation of 3 miles per gallon. If you drive this car many times, the gas mileage
on 95% of the trips will be between -
Answer✓✓
34 and 46 miles per gallon
2
, Quiz____?
Consider again the car described in question 6. On about what percentage of the trips will the
gas mileage be less than 37 miles per gallon? -
Answer✓✓
16%
Quiz____?
Consider an exam with a normal distribution of scores with a mean of 75 and a standard
deviation of 6. If you get a 66 on the exam, your standard score (z-score) is -
Answer✓✓
-1.5
Quiz____?
A friend tells you that his IQ is in the 102nd percentile. You can conclude that -
Answer✓✓
he doesn't understand percentiles
Quiz____?
Researchers are testing a new cancer treatment. To determine whether the treatment offers a
statistically significant improvement in survival rates, the researchers must -
3
Quiz____?
Graphs of normal distributions -
Answer✓✓
always have the same characteristic bell shape
Quiz____?
In a normal distribution, the mean -
Answer✓✓
is equal to the median
Quiz____?
In a normal distribution, data values farther from the mean are -
Answer✓✓
less common than data values close to the mean
1
, Quiz____?
Consider wages at a fast food restaurant where most of the workers earn the minimum wage.
Would you expect the wages of all workers at this restaurant to have a normal distribution? -
Answer✓✓
no, because a normal distribution is symmetric, but no one earns less than the minimum wage
Quiz____?
In a normal distribution, about two-thirds of the data values fall within -
Answer✓✓
1 standard deviation of the mean
Quiz____?
Suppose a car driven under different conditions gets a mean gas mileage of 40 miles per gallon
with a standard deviation of 3 miles per gallon. If you drive this car many times, the gas mileage
on 95% of the trips will be between -
Answer✓✓
34 and 46 miles per gallon
2
, Quiz____?
Consider again the car described in question 6. On about what percentage of the trips will the
gas mileage be less than 37 miles per gallon? -
Answer✓✓
16%
Quiz____?
Consider an exam with a normal distribution of scores with a mean of 75 and a standard
deviation of 6. If you get a 66 on the exam, your standard score (z-score) is -
Answer✓✓
-1.5
Quiz____?
A friend tells you that his IQ is in the 102nd percentile. You can conclude that -
Answer✓✓
he doesn't understand percentiles
Quiz____?
Researchers are testing a new cancer treatment. To determine whether the treatment offers a
statistically significant improvement in survival rates, the researchers must -
3
