Question

According to a social media blog, time spent on a certain social networking website has a mean of 20 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 6 minutes. Complete parts (a) through (d) below.

a. If you select a random sample of 16 sessions, what is the probability that the sample mean is between 19.5 and 20.5 minutes? (Round to three decimal places as needed.)

b. If you select a random sample of 16 sessions, what is the probability that the sample mean is between 19 and 20 minutes? (Round to three decimal places as needed.)

c. If you select a random sample of 100 sessions, what is the probability that the sample mean is between 19.5 and 20.5 minutes? (Round to three decimal places as needed.)

d. Explain the difference in the results of (a) and (c). The
sample size in (c) is greater than the sample size in (a), so the
standard error of the mean (or the standard deviation of the
sampling distribution) in (c) is ▼ ** less or
greater** than in (a). As the standard error ▼

Answer #1

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The sample size in (c) is greater than the sample size in (a), so
the standard error of the mean (or the standard deviation of the
sampling distribution) in (c) is ▼ ** less**
than in (a). As the standard error ▼

According to a social media blog, time spent on a certain
social networking website has a mean of 24 minutes per visit.
Assume that time spent on the social networking site per visit is
normally distributed and that the standard deviation is 7
minutes.
a. If you select a random sample of 25 sessions, what is the
probability that the sample mean is between 23.5 and 24.5 minutes?
(Round to three decimal places as needed.)
b. If you select a...

According to a social media? blog, time spent on a certain
social networking website has a mean of 23 minutes per visit.
Assume that time spent on the social networking site per visit is
normally distributed and that the standard deviation is 4 minutes.
Complete parts? (a) through? (d) below. a. If you select a random
sample of 36 ?sessions, what is the probability that the sample
mean is between 22.5 and 23.5 ?minutes? nothing ?(Round to three
decimal places...

According to a social media blog, time spent on a certain
social networking website has a mean of 17 minutes per visit.
Assume that time spent on the social networking site per visit is
normally distributed and that the standard deviation is 5 minutes.
Complete parts (a) through (d) below.
a. If you select a random sample of 16
sessions, what is the probability that the sample mean is
between
16.5 and 17.5 minutes?
(Round to three decimal places as...

According to a social media blog, time spent on a certain
social networking website has a mean of 17 minutes per visit.
Assume that time spent on the social networking site per visit is
normally distributed and that the standard deviation is 7 minutes.
Complete parts (a) through (d) below.
a. If you select a random sample of
36sessions, what is the probability that the sample mean is
between 16.5 and 17.5 minutes?
b. If you select a random sample...

According to a social media blog, time spent on a certain
social networking website has a mean of 16 minutes per visit.
Assume that time spent on the social networking site per visit is
normally distributed and that the standard deviation is 5
minutes.
If you select a random sample of 36 sessions, what is the
probability that the sample mean is between 15.5 and 16.5
minutes?
(Round your answer to three decimal places)

According to a social media blog, time spent on a certain
social networking website has a mean of 18 minutes per visit.
Assume that time spent on the social networking site per visit is
normally distributed and that the standard deviation is 4
minutes.
If you select a random sample of 100 sessions, what is the
probability that the sample mean is between 17.5 and 18.5
minutes?

A study showed that in a certain month, the mean time spent per
visit to Facebook was 19.5 minutes. Assume the standard deviation
of the population is 8 minutes. Suppose that a simple random sample
of 100 visits in that month has a sample mean of 21.14 minutes. A
social scientist is interested in knowing whether the mean time of
Facebook visits has increased. Perform the hypothesis test and
compute the P-value.
Write down your P-value.
Round your answer to...

A study showed that in a certain month, the mean time spent per
visit to Facebook was 19.5 minutes. Assume the standard deviation
of the population is 8 minutes. Suppose that a simple random sample
of 100 visits in that month has a sample mean of 21.66 minutes. A
social scientist is interested in knowing whether the mean time of
Facebook visits has increased. Perform the hypothesis test and
compute the P-value.
Write down your P-value. You will need it...

Suppose a geyser has a mean time between eruptions of 79
minutes. Let the interval of time between the eruptions be normally
distributed with standard deviation 22 minutes. Complete parts (a)
through (e) below.
(a) What is the probability that a randomly selected time
interval between eruptions is longer than 90 minutes? The
probability that a randomly selected time interval is longer than
90 minutes is approximately nothing. (Round to four decimal places
as needed.)
(b) What is the probability...

A researcher records the amount of time (in minutes) that
parent-child pairs spent on social networking sites to test whether
they show any generational differences. From the following findings
reported in APA format, interpret these results.
Parents spent significantly less time on social networking sites
compared to their children
(MD = 42 minutes),
t(29) = 3.343,
p < 0.05,
d = 0.61.
State the research design used (repeated measures or matched
pairs).
repeated measures designmatched pairs
design
State the sample...

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