Lecture Exam 2

A  The population standard deviation

B  The sample mean

C  The sample standard deviation

D  The sample variance

E  The desired alpha level

A  55%

B  95%

C  99.7%

D  68%

E  43%

A  Approximately 80% of infants fall within 10.28 standard deviations from the mean.

B  Approximately 80% of infants fall between 1.28 pounds and –1.28 pounds.

C  Approximately 80% of infants fall within 1.28 pounds above and below the mean.

D  Approximately 80% of infants fall within 2.8 pounds above and below the mean.

E  Approximately 80% of infants fall within 1.28 standard deviations above and below the mean.

A  Bell-shaped

B  Symmetrical

C  The total area under the curve is 1.0 or 100%

D  The mean is significantly higher than the median

E  Peaks midway along the horizontal spread

A  The probability that a person who works overnight shifts will get 6.5 hours of sleep or more per day is 3.45%.

B  The probability that a person who works overnight shifts will get 7.5 hours of sleep or more per day is 3.45%.

C  3.45% of people who worked overnight shifts reported more than 7.5 hours of sleep per day.

D  The probability of obtaining a result as extreme or more extreme than the one observed if the null hypothesis is true is 3.45%.

E  The probability of obtaining a result less extreme than the one observed if the null hypothesis was true is 3.45%.

A  TRUE

B  FALSE

A  TRUE

B  FALSE

A  TRUE

B  FALSE

A  TRUE

B  FALSE

A  FALSE

B  TRUE