Question

In a recent study, Lepp, Barkley, and Karpinski (2014) reported
that undergraduate students spend an average of 278.67 (standard
error of the mean = 9.79) minutes per day using their cell phones.
You may wonder whether cell phone usage at your university differs
significantly from Lepp, Barkley, and Karpinski’s (2014) findings.
Suppose a recent survey of students at your university found that
students spend 255 minutes per day using their cell phones.
*Note that standard error of the mean and standard deviation are
not the same thing. Standard error is a measurement on the sampling
distribution; we calculate it using the standard deviation of the
data as well as the number of samples collected:*

In our example of cell phone data, what would our two-sided p-value be if the sample standard deviation was 60.2 (to 7 decimal places)?

Answer #1

Given the sample mean sample standard deviation .

The two sided confidence interval for mean based on the sample data is

The hypotheses are

The test statistic is . Here is the standard error of the mean.

So,

The two-sided p-value is

If P-value , we reject the null hypothesis.

In a study entitled “How Much Undergraduate Students Drink”, it was
reported that undergraduate students spend $868. This figure was an
all-time high and had increased 44% over the previous five years.
Assume that a current study is being conducted to determine if it
can be concluded that the expenditure of students on alcohol has
continued to increase compared to the original report. Based on
previous studies, use a population standard deviation of $400.
1. State the Null and alternative...

In a study entitled How Undergraduate Students Use Credit Cards,
it was reported that undergraduate students have a mean credit card
balance of $3,173 (Sallie Mae, April 2009). This figure was an
all-time high and had increased 44% over the previous five years.
Assume that a current study is being conducted to determine if it
can be concluded that the mean credit card balance for
undergraduate students has continued to increase compared to the
April 2009 report. Based on previous...

In a study entitled How Undergraduate Students Use Credit Cards,
it was reported that undergraduate students have a mean credit card
balance of $3,316 . This figure was an all-time high and had
increased 49% over the previous five years. Assume that a current
study is being conducted to determine if it can be concluded that
the mean credit card balance for undergraduate students has
continued to increase compared to the report. Based on previous
studies, use a population standard...

Do male college students spend more time than female college
students using a computer? This was one of the questions
investigated by the authors of an article. Each student in a random
sample of 46 male students at a university in England and each
student in a random sample of 38 female students from the same
university kept a diary of how he or she spent time over a
three-week period.
For the sample of males, the mean time spent...

Do male college students spend more time than female college
students using a computer? This was one of the questions
investigated by the authors of an article. Each student in a random
sample of 46 male students at a university in England and each
student in a random sample of 38 female students from the same
university kept a diary of how he or she spent time over a
three-week period.
For the sample of males, the mean time spent...

Do male college students spend more time than female college
students using a computer? This was one of the questions
investigated by the authors of an article. Each student in a random
sample of 46 male students at a university in England and each
student in a random sample of 38 female students from the same
university kept a diary of how he or she spent time over a
three-week period.
For the sample of males, the mean time spent...

Do female college students spend more time than male college
students watching TV? This was one of the questions investigated by
the authors of an article. Each student in a random sample of 46
male students at a university in England and each student in a
random sample of 38 female students from the same university kept a
diary of how he or she spent time over a three-week period.
For the sample of males, the mean time spent watching...

Do female college students spend more time than male college
students watching TV? This was one of the questions investigated by
the authors of an article. Each student in a random sample of 46
male students at a university in England and each student in a
random sample of 38 female students from the same university kept a
diary of how he or she spent time over a three-week period.
For the sample of males, the mean time spent watching...

In a study entitled How Undergraduate Students Use Credit Cards,
it was reported that undergraduate students have a mean credit card
balance of $3,173. This figure was an all-time high and had
increased 44% over the previous five years. Assume that a current
study is being conducted to determine if it can be concluded that
the mean credit card balance for undergraduate students has
continued to increase compared to the original report. Based on
previous studies, use a population standard...

It has been reported by a university’s president that 60% of the
students are using their cell phones during class to text their
peers. A professor wants to see if her students are using their
cell phones less frequently than the general population. The
professor surveys the students and ask them to report the number of
minutes they use the cell phones during a day at the university
Using SPSS conduct a t-test to test the professor’s
assumption that her...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 13 minutes ago

asked 20 minutes ago

asked 20 minutes ago

asked 21 minutes ago

asked 27 minutes ago

asked 27 minutes ago

asked 27 minutes ago

asked 30 minutes ago

asked 31 minutes ago

asked 32 minutes ago

asked 36 minutes ago

asked 43 minutes ago