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.

μ1μ1 indicates the population mean memory recall score for non-users.

μ2μ2 indicates the population mean memory recall score for marijuana users.

The 99% confidence interval for the difference of means was found to be:

2.1 < μ1−μ2μ1-μ2 < 15.9

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

- Yes
- No

Why or why not?

Answer #1

a 99% confidence interval for the difference of means = (2.1 , 15.9)

Since the confidence interval does not include 0, so we can say that the population mean memory recall score for non users and marijuana users are significantly different.

Moreover,

lower boundary of the interval > 0, so at 99% level of confidence or at 1% level of significance, we can conclude that marijuana users have less short-term memory than non-users.

ans-> Yes

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...

Suppose a cognitive psychologist conducts a study on the effects
of long-term substance use on short-term memory. The researcher
recruits a total of 30 participants, where 10 participants are
identified as marijuana users, 10 participants are alcohol users,
and 10 participants identify as using no substances. Participants
in each group were given a list of 20 nouns to memorize for 15
minutes. Participants were then given a 15- minute break and then
asked to write down/recall as many of the...

1.The sample mean is an unbiased estimator for
the population mean. This means:
The sample mean always equals the population mean.
The average sample mean, over all possible samples, equals the
population mean.
The sample mean will only vary a little from the population
mean.
The sample mean has a normal distribution.
2.Which of the following statements is
CORRECTabout the sampling distribution of the
sample mean:
The standard error of the sample mean will decrease as the
sample size increases....

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 10 minutes ago

asked 10 minutes ago

asked 15 minutes ago

asked 24 minutes ago

asked 31 minutes ago

asked 36 minutes ago

asked 44 minutes ago

asked 46 minutes ago

asked 49 minutes ago

asked 1 hour ago

asked 1 hour ago