Question

A study was conducted to test whether marijuana use impacts your short-term memory. A simple random sample of college students that do NOT use marijuana was taken, and given a memory test in which they were shown items in a particular order then asked to recreate that ordering. A second simple random sample was taken of college students that use marijuana 4 - 7 days per week, and they were given the same memory test.

A higher score on the memory test indicates better memory recall.

μ1 indicates the population mean memory recall score for non-users.

μ2 indicates the population mean memory recall score for marijuana users.

The 95% confidence interval for the difference of means was found to be:

2.5 < μ1−μ2 < 16.4

Can we support the claim that marijuana users have less short-term memory than non-users?

- Yes
- No

Why or why not?

A retrospective study of 157 pairs of twins was performed. The twin pairs each had one male child and one female child. Their birth weights were studied to determine if the male twin was consistently heavier.

The difference in weights was calculated by subtracting the female weight (in ounces) from the male weight (in ounces):

d=xm−xf

After looking at 157 pairs of twins, the study finds the 95% confidence interval for the mean difference of weights (in ounces) is:

-2.7 < μd < 1.1

Can we be reasonably sure that the male twins are heavier than the females?

- Yes
- No

Why or why not?

Answer #1

A) The 95% CI is:

2.5 < μ1−μ2 < 16.4

As the confidence interval does not contain 0, we can say that
the population mean memory recall score for non-users is
significantly higher than marijuana users.

Hence, we support the claim that marijuana users have less
short-term memory than non-users

Answer: YES

B) The confidence interval for the difference in weights is:
-2.7 < μd < 1.1

As the confidence interval contains 0, we can say that the
difference is not significantly different than zero.

Hence, we cannot be reasonably sure that the difference in weights
between male twins and female twins is different.

Answer: NO

A study was conducted to test whether marijuana use impacts your
short-term memory. A simple random sample of college students that
do NOT use marijuana was taken, and given a memory test in which
they were shown items in a particular order then asked to recreate
that ordering. A second simple random sample was taken of college
students that use marijuana 4 - 7 days per week, and they were
given the same memory test.
A higher score on the...

A study was conducted to test whether marijuana use impacts your
short-term memory. A simple random sample of college students that
do NOT use marijuana was taken, and given a memory test in which
they were shown items in a particular order then asked to recreate
that ordering. A second simple random sample was taken of college
students that use marijuana 4 - 7 days per week, and they were
given the same memory test.
A higher score on the...

A study was conducted to test whether marijuana use impacts your
short-term memory. A simple random sample of college students that
do NOT use marijuana was taken, and given a memory test in which
they were shown items in a particular order then asked to recreate
that ordering. A second simple random sample was taken of college
students that use marijuana 4 - 7 days per week, and they were
given the same memory test.
A higher score on the...

A retrospective study of 102 pairs of twins was performed. The
twin pairs each had one male child and one female child. Their
birth weights were studied to determine if the male twin was
consistently heavier.
The difference in weights was calculated by subtracting the
female weight (in ounces) from the male weight (in ounces):
d=xm−xfd=xm-xf
After looking at 102 pairs of twins, the study finds the 95%
confidence interval for the mean difference of weights (in ounces)
is:
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