Exam 2

A  Its impossible to estimate the population mean

B  The true population mean less than 60

C  The estimated population mean is precisely 60

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

A  58.68 – 61.32

B  57.99 – 62.01

C  58.79 – 61.21

D  56.23 – 63.97

A  47.98 – 73.-01

B  59.02 – 60.98

C  58.64 – 62.26

D  59.08 – 60.92

A  0.48

B  0.65

C  0.72

D  0.47

A  47.61

B  45.22

C  2.39

D  4.18

A  1.73

B  -2.98

C  -1.73

D  2.98

A  0.84

B  0.15

C  0.45

D  0.4

A  0.54

B  0.28

C  0.46

D  0.4

A  sample

B  population

C  census

D  survey

A  lose a degee of certainty but gain precision

B  gain statistical significance and gain precision

C  lose precision but gain certainty

D  none of the above

A  is qual to the sample size minus 1

B  is the standard deviation of a theoretical sampling distribution

C  is the same as the sample standard deviation

D  is the same as the population standard deviation

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  mean variance

B  population variance

C  sample variance

D  sampling error

A  cannot be determined by the information provided.

B  0.32

C  0.032

D  68

A  34

B  50

C  68

D  26

A  50

B  44

C  10

D  95

A  A theoretical ideal

B  Applicable to all real life research situations

C  positively skewed

D  All of the above.

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

B  it is skewed

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

D  it is a probability distribution

A  a 1.0 probability implies something is impossible

B  a 0 probability implies something is possible

C  a probability varies from 0 to 1.0

D  none of the above are true

A  The normal curve is symmetrical

B  The tails extend indefinitely in either direction

C  The normal curve is unimodal

D  All of the above.

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

B  The number of times that a particular event and any other event can 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 mean deviation

B  the standard deviation

C  The range

D  the variance

A  ordinal level

B  nominal level

C  interval level

D  all of the above.

A  B

B  A

C  C

D  D

A  the standard deviation and the variance

B  the middlemost and the highest score

C  the highest and the lowest scores

D  the mean and the standard deviation

A  chi square

B  the mode

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  increases

B  remains the same

C  decreases

D  none of the above

A  greater than the population mean

B  less than the population standard deviation

C  equal to the population mean

D  none of the above.

A  of the operation of chance

B  the measure device is flawed

C  of a calculation error in obtaining the sample mean

D  the investigator chooses the wrong sample