STAT 200 WEEK 8 HOMEWORK – 9.6/10 – 96%
Question 1 (0.5 points)
A team of cognitive psychologists studying the effects of sleep deprivation on short-term memory
decay had eight participants stay in a sleep lab for two days. Four participants were randomly assigned
to a condition in which they were not permitted to sleep during that period, while the other four
participants were allowed to sleep when they wanted to. At the end of the two days, the participants
completed a short-term memory task that yielded the results in the table that follows.
Mean Number of Letters Remembered
Sleep Deprived Normal Sleep
7 9
8 8
7 11
9 7
Using the .05 significance level, did sleep deprivation reduce short-term memory?
Choose the correct HO and HA statements:
Question 1 options:
A) HO : μdeprived = μnormal
HA : μdeprived < μnormal
B)
HO : μdeprived =
μnormal HA : μdeprived ≠
μnormal
C)
HO : pdeprived =
pnormal HA : pdeprived <
pnormal
D)
HO : μdeprived =
μnormal HA : μdeprived >
μnormal
, Question 2 (1 point)
A team of cognitive psychologists studying the effects of sleep deprivation on short-term memory
decay had eight participants stay in a sleep lab for two days. Four participants were randomly assigned
to a condition in which they were not permitted to sleep during that period, while the other four
participants were allowed to sleep when they wanted to. At the end of the two days, the participants
completed a short-term memory task that yielded the results in the table that follows.
Mean Number of Letters Remembered
Sleep Deprived Normal Sleep
7 9
8 8
7 11
9 7
Using the .05 significance level, did sleep deprivation reduce short-term memory?
The most appropriate hypothesis test to use for this scenario is:
Question 2 options:
A) t - test for independent means
B) t – test for dependent means
C) two-population proportion t-test
D) z – test for two population means
E) Χ2 test for independence
Question 3 (0.5 points)
A B2B Marketing Insider blog of October 7, 2010 examined five currently-used sales closing techniques.
Sales scenarios are presented to a sample of 230 purchasing executives. Each subject received one of the
five closing techniques or a scenario in which no sales close was achieved. After reading the sales
scenario, each executive was asked to rate his/her level of trust in the salesperson on a 7-point scale. The
Question 1 (0.5 points)
A team of cognitive psychologists studying the effects of sleep deprivation on short-term memory
decay had eight participants stay in a sleep lab for two days. Four participants were randomly assigned
to a condition in which they were not permitted to sleep during that period, while the other four
participants were allowed to sleep when they wanted to. At the end of the two days, the participants
completed a short-term memory task that yielded the results in the table that follows.
Mean Number of Letters Remembered
Sleep Deprived Normal Sleep
7 9
8 8
7 11
9 7
Using the .05 significance level, did sleep deprivation reduce short-term memory?
Choose the correct HO and HA statements:
Question 1 options:
A) HO : μdeprived = μnormal
HA : μdeprived < μnormal
B)
HO : μdeprived =
μnormal HA : μdeprived ≠
μnormal
C)
HO : pdeprived =
pnormal HA : pdeprived <
pnormal
D)
HO : μdeprived =
μnormal HA : μdeprived >
μnormal
, Question 2 (1 point)
A team of cognitive psychologists studying the effects of sleep deprivation on short-term memory
decay had eight participants stay in a sleep lab for two days. Four participants were randomly assigned
to a condition in which they were not permitted to sleep during that period, while the other four
participants were allowed to sleep when they wanted to. At the end of the two days, the participants
completed a short-term memory task that yielded the results in the table that follows.
Mean Number of Letters Remembered
Sleep Deprived Normal Sleep
7 9
8 8
7 11
9 7
Using the .05 significance level, did sleep deprivation reduce short-term memory?
The most appropriate hypothesis test to use for this scenario is:
Question 2 options:
A) t - test for independent means
B) t – test for dependent means
C) two-population proportion t-test
D) z – test for two population means
E) Χ2 test for independence
Question 3 (0.5 points)
A B2B Marketing Insider blog of October 7, 2010 examined five currently-used sales closing techniques.
Sales scenarios are presented to a sample of 230 purchasing executives. Each subject received one of the
five closing techniques or a scenario in which no sales close was achieved. After reading the sales
scenario, each executive was asked to rate his/her level of trust in the salesperson on a 7-point scale. The
