FINAL EXAM STATS
If a company employs 3,500 people and if a random sample of 175 of these employees
has been taken by systematic sampling, the researcher would start the sample selection
between what two values? - ANS 0 and 20
The Aluminum Association reports that the average American uses 56.8 pounds of
aluminum in a year. A random sample of 51 households is monitored for one year to
determine aluminum usage. If the population standard deviation of annual usage is 12.3
pounds, what is the probability that the sample mean will be between 56 and 58 pounds
________. - ANS 0.2580 (WRONG)
Albert Abbasi, VP of Operations at Ingleside International Bank, is evaluating the
service level provided to walk-in customers. Accordingly, he plans a sample of waiting
times for walk-in customers. If the population of waiting times has a mean of 15 minutes
and a standard deviation of 4 minutes, the probability that Albert's sample of 64 will
have a mean less than 16 minutes is ________. - ANS 0.0228 (WRONG)
Suppose 40% of all college students have a computer at home and a sample of 100 is
taken. What is the probability that more than 50 of those in the sample have a computer
at home? - ANS 0.0207
The Aluminum Association reports that the average American uses 56.8 pounds of
aluminum in a year. A random sample of 51 households is monitored for one year to
determine aluminum usage. If the population standard deviation of annual usage is 12.3
pounds, what is the probability that the sample mean will be more than 59 pounds
_________. - ANS 0.0003
***************
(WRONG)
A paired difference experiment produced the following results:
n=41; X1=95; X2=89; Sd=6.7823
Then for testing H0: D ≤ 0 against Ha: D > 0, the proper test statistic and the critical
value of significance level 0.05 are __________ - ANS 5.66 and 1.6839
, To determine if a training program has improved the average performance of trainees
the sample data must be based on __________. - ANS matched-pairs observations
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AF, monitors the
default rate on personal loans at the AFB member banks. One of her standards is "no
more than 5% of personal loans should be in default." On each Friday, the default rate is
calculated for a sample of 500 personal loans. Last Friday's sample contained 30
defaulted loans. Using α
= 0.10, the critical z value is _______. - ANS -1.28
***********************(WRONG)
To determine if a training program has improved the average performance of trainees if
data is collected from two different groups of managers (one group that has not
undertaken the training program and the other group that has completed the training
program), the samples are __________. - ANS independent
The executives of CareFree Insurance, Inc. feel that "a majority of our employees
perceive a participatory management style at CareFree." A random sample of 200
CareFree employees is selected to test this hypothesis at the 0.05 level of significance.
Eighty employees rate the management as participatory. The null hypothesis is
__________. - ANS p ≥ 0.50
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AF, monitors the
default rate on personal loans at the AFB member banks. One of her standards is "no
more than 5% of personal loans should be in default." On each Friday, the default rate is
calculated for a sample of 500 personal loans. Last Friday's sample contained 30
defaulted loans. Using α
= 0.10, the appropriate decision is _______. - ANS reduce the sample size
*****************(WRONG)
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AF, monitors the
default rate on personal loans at the AFB member banks. One of her standards is "no
more than 5% of personal loans should be in default." On each Friday, the default rate is
calculated for a sample of 500 personal loans. Last Friday's sample contained 30
defaulted loans. Using α
= 0.10, the observed z value is _______. - ANS -1.03
***********************(WRONG)
If a company employs 3,500 people and if a random sample of 175 of these employees
has been taken by systematic sampling, the researcher would start the sample selection
between what two values? - ANS 0 and 20
The Aluminum Association reports that the average American uses 56.8 pounds of
aluminum in a year. A random sample of 51 households is monitored for one year to
determine aluminum usage. If the population standard deviation of annual usage is 12.3
pounds, what is the probability that the sample mean will be between 56 and 58 pounds
________. - ANS 0.2580 (WRONG)
Albert Abbasi, VP of Operations at Ingleside International Bank, is evaluating the
service level provided to walk-in customers. Accordingly, he plans a sample of waiting
times for walk-in customers. If the population of waiting times has a mean of 15 minutes
and a standard deviation of 4 minutes, the probability that Albert's sample of 64 will
have a mean less than 16 minutes is ________. - ANS 0.0228 (WRONG)
Suppose 40% of all college students have a computer at home and a sample of 100 is
taken. What is the probability that more than 50 of those in the sample have a computer
at home? - ANS 0.0207
The Aluminum Association reports that the average American uses 56.8 pounds of
aluminum in a year. A random sample of 51 households is monitored for one year to
determine aluminum usage. If the population standard deviation of annual usage is 12.3
pounds, what is the probability that the sample mean will be more than 59 pounds
_________. - ANS 0.0003
***************
(WRONG)
A paired difference experiment produced the following results:
n=41; X1=95; X2=89; Sd=6.7823
Then for testing H0: D ≤ 0 against Ha: D > 0, the proper test statistic and the critical
value of significance level 0.05 are __________ - ANS 5.66 and 1.6839
, To determine if a training program has improved the average performance of trainees
the sample data must be based on __________. - ANS matched-pairs observations
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AF, monitors the
default rate on personal loans at the AFB member banks. One of her standards is "no
more than 5% of personal loans should be in default." On each Friday, the default rate is
calculated for a sample of 500 personal loans. Last Friday's sample contained 30
defaulted loans. Using α
= 0.10, the critical z value is _______. - ANS -1.28
***********************(WRONG)
To determine if a training program has improved the average performance of trainees if
data is collected from two different groups of managers (one group that has not
undertaken the training program and the other group that has completed the training
program), the samples are __________. - ANS independent
The executives of CareFree Insurance, Inc. feel that "a majority of our employees
perceive a participatory management style at CareFree." A random sample of 200
CareFree employees is selected to test this hypothesis at the 0.05 level of significance.
Eighty employees rate the management as participatory. The null hypothesis is
__________. - ANS p ≥ 0.50
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AF, monitors the
default rate on personal loans at the AFB member banks. One of her standards is "no
more than 5% of personal loans should be in default." On each Friday, the default rate is
calculated for a sample of 500 personal loans. Last Friday's sample contained 30
defaulted loans. Using α
= 0.10, the appropriate decision is _______. - ANS reduce the sample size
*****************(WRONG)
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AF, monitors the
default rate on personal loans at the AFB member banks. One of her standards is "no
more than 5% of personal loans should be in default." On each Friday, the default rate is
calculated for a sample of 500 personal loans. Last Friday's sample contained 30
defaulted loans. Using α
= 0.10, the observed z value is _______. - ANS -1.03
***********************(WRONG)
