Question

A study investigated if cell phone use impacted student drivers' reaction times. There were two groups: 22 students were assigned to the cell phone group while 22 students were assigned to the control group. The experiment measured the response time to traffic lights; for the cell phone group, the mean was 585.7 with a standard deviation of 86.6 and for the control group, the mean was 536.8 with a standard deviation of 66.3. Construct a 90% confidence interval for the difference in mean response times between the cell phone and control groups.

Point Estimate: = x bar 1- x bar2 = 48.9

Margin of Error: E = (round to 4 decimal places)

Lower Limit: (round to 4 decimal places)

Upper Limit: (round to 4 decimal places)

We are 90% confident that the true difference in population means is between LOWER LIMIT and UPPER LIMIT. Please be extremely detailed.

Answer #1

Several states are considering legislation that would limit the
use of cell phones while driving an automobile. A researcher at the
University of Utah investigated whether cell phone use impairs
drivers’ reaction times. Sixty-four randomly selected students were
divided evenly into a treatment group and a control group.
Participants were instructed to press a break button on a driving
simulator when a red light flashed. The control, or ” no phone”,
group listened to the radio while they performed the...

Two researchers conducted a study in which two groups of
students were asked to answer 42 trivia questions from a board
game. The students in group 1 were asked to spend 5 minutes
thinking about what it would mean to be a professor, while the
students in group 2 were asked to think about soccer hooligans.
These pretest thoughts are a form of priming. The 200 students in
group 1 had a mean score of 22.9 with a standard deviation...

Two researchers conducted a study in which two groups of
students were asked to answer 42 trivia questions from a board
game. The students in group 1 were asked to spend 5 minutes
thinking about what it would mean to be a professor, while the
students in group 2 were asked to think about soccer hooligans.
These pretest thoughts are a form of priming. The 200 students in
group 1 had a mean score of 24.1 with a standard deviation...

In a study of cell phone use and brain hemispheric dominance,
an Internet survey was e-mailed to 2662
subjects randomly selected from an online group involved with
ears. 1018 surveys were returned. Construct a
99% confidence interval for the proportion of returned
surveys.
a) Find the best point estimate of the population proportion
p.
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
(Round to three decimal places as needed.)
c) Construct...

In a study of cell phone use and brain hemispheric dominance,
an Internet survey was e-mailed to 2353 subjects randomly selected
from an online group involved with ears. 965 surveys were returned.
Construct a 95% confidence interval for the proportion of returned
surveys.
a) Find the best point estimate of the population proportion
p.
________?
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
E=______?
(Round to three decimal places as needed.)...

Two researchers conducted a study in which two groups of
students were asked to answer 42 trivia questions from a board
game. The students in group 1 were asked to spend 5 minutes
thinking about what it would mean to be a professor, while the
students in group 2 were asked to think about soccer hooligans.
These pretest thoughts are a form of priming. The 200 students in
group 1 had a mean score of 22.8 with a standard deviation...

The birth weights for
two groups of babies were compared in a study. In one group the
mothers took a zinc supplement during pregnancy. In another group,
the mothers took a placebo. A sample of 3232 babies in the zinc
group had a mean birth weight of 32363236 grams. A sample of 3131
babies in the placebo group had a mean birth weight of 31833183
grams. Assume that the population standard deviation for the zinc
group is 775775 grams, while...

The
birth weights for two groups of babies were compared in a study. In
one group the mothers took zinc supplement during pregnancy. In
another group, the mothers took a placebo. A sample of 126 babies
in the zinc group had a mean birth weight of 3305 grams. A sample
of 113 babies in the placebo group had a mean birth weight of 3476
grams. Assume that the population standard deviation for the zinc
group is 871 grams, while the...

A study was designed to compare the attitudes of two groups of
nursing students towards computers. Group 1 had previously taken a
statistical methods course that involved significant computer
interaction. Group 2 had taken a statistic methods course that did
not use computers. The students' attitudes were measured by
administering the Computer Anxiety Rating Scale (CARS). A random
sample of 13 nursing students from Group 1 resulted in a mean score
of 66.6 with a standard deviation of 7 ....

Three experiments investigating the relation between need for
cognitive closure and persuasion were performed. Part of the study
involved administering a "need for closure scale" to a group of
students enrolled in an introductory psychology course. The "need
for closure scale" has scores ranging from 101 to 201. For the 84
students in the highest quartile of the distribution, the mean
score was x = 175.30. Assume a population standard
deviation of σ = 7.89. These students were all classified...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 10 minutes ago

asked 34 minutes ago

asked 34 minutes ago

asked 37 minutes ago

asked 52 minutes ago

asked 53 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago