Exam 2

A  The true population mean less than 60

B  The estimated population mean is precisely 60

C  Its impossible to estimate the population mean

D  We can be 95% certainty that the true population mean lies within our 95% confidence interval

A  58.68 – 61.32

B  56.23 – 63.97

C  58.79 – 61.21

D  57.99 – 62.01

A  59.08 – 60.92

B  47.98 – 73.-01

C  58.64 – 62.26

D  59.02 – 60.98

A  0.48

B  0.47

C  0.72

D  0.65

A  2.39

B  4.18

C  45.22

D  47.61

A  -1.73

B  1.73

C  2.98

D  -2.98

A  0.15

B  0.4

C  0.84

D  0.45

A  0.4

B  0.54

C  0.28

D  0.46

A  census

B  survey

C  sample

D  population

A  lose a degee of certainty but gain precision

B  lose precision but gain certainty

C  gain statistical significance and gain precision

D  none of the above

A  is qual to the sample size minus 1

B  is the same as the sample standard deviation

C  is the same as the population standard deviation

D  is the standard deviation of a theoretical sampling distribution

A  has a standard deviation smaller than that of the population

B  approximates the normal curve

C  has a mean equal to the population mean

D  all of the above

A  population variance

B  sample variance

C  sampling error

D  mean variance

A  68

B  0.032

C  cannot be determined by the information provided.

D  0.32

A  68

B  50

C  26

D  34

A  95

B  10

C  50

D  44

A  A theoretical ideal

B  positively skewed

C  Applicable to all real life research situations

D  All of the above.

A  its total area contains 100% of the cases (scores)

B  it is a probability distribution

C  it is skewed

D  The mode, the median, and the mean are identical

A  a 0 probability implies something is possible

B  a probability varies from 0 to 1.0

C  a 1.0 probability implies something is impossible

D  none of the above are true

A  The tails extend indefinitely in either direction

B  The normal curve is unimodal

C  The normal curve is symmetrical

D  All of the above.

A  The number of times that a particular event and any other event can occur

B  The number of times a particular event or outcome can occur relative to the number of times that any event CANNOT occur

C  The number of times that a particular event can occur minus the number of times another event can occur.

D  the number of times a particular event or outcome can occur relative to the total number of times any event can occur

A  the standard deviation

B  The range

C  the mean deviation

D  the variance

A  interval level

B  ordinal level

C  nominal level

D  all of the above.

A  D

B  B

C  A

D  C

A  the standard deviation and the variance

B  the mean and the standard deviation

C  the middlemost and the highest score

D  the highest and the lowest scores

A  the mode

B  chi square

C  the median

D  the standard deviation

A  the number of scores in a sample

B  the spread of the sample scores

C  the precision of the sample mean

D  the representation of the sample

A  decreases

B  increases

C  remains the same

D  none of the above

A  equal to the population mean

B  greater than the population mean

C  less than the population standard deviation

D  none of the above.

A  the investigator chooses the wrong sample

B  of the operation of chance

C  of a calculation error in obtaining the sample mean

D  the measure device is flawed