For each question, encircle the correct answer.
1) The width of the confidence interval estimate is...
For each question, encircle the correct answer.
1) The width of the confidence interval estimate is __________
the margin of error
. A) Equal to
B) Half of
C) Double
D) None of the above.
2) Suppose in all Math117 sections, 10% of the students are
left-handed. A sample of 20 students have been randomly selected.
The expected number of left-handed students in the sample is
A) 2
B) 5
C) 10
D) 16
3 ) Which of the following...
A data set contains ordinal data, a total sample size
of 5, and the pretest and...
A data set contains ordinal data, a total sample size
of 5, and the pretest and post test results of each participant.
The researcher uses which of the following tests to calculate the
final statistics?
a. Independent t test
b. Mann Whitney U test
c. Paired t test
d. Wilcox on matched pairs test
For each question, encircle the correct answer.
6 )In a population of 100 items where 20...
For each question, encircle the correct answer.
6 )In a population of 100 items where 20 items are defective. A
sample of 40 items has been selected randomly from the population
and 10 of the them are defective. The sampling error of the
proportion is
A) 0.05
B) 0.2
C) 0.25
D) 1
7 )If a population has a highly skewed distribution, which of
the following sample sizes is more likely to be sufficiently large
that the distribution of the...
Question 3 (5.5 marks = 1.5 + 1 + 2 + 1) The set of data...
Question 3 (5.5 marks = 1.5 + 1 + 2 + 1) The set of data below
are from a sample of n = 7 7, -6, -3, 1, 9, 4, 7 a. Calculate the
mean, median, and mode b. Calculate the range and range c.
Calculate the variance and standard deviation d. Do your calculated
values of the mean, median, and mode suggest that this distribution
is symmetrical, negatively skewed or positively skewed? Please
explain your answer in one...
1. Below are several research scenarios. Indicate which set of
statistical analyses should be used to...
1. Below are several research scenarios. Indicate which set of
statistical analyses should be used to analyze the data collected
in study, and explain why that statistical test should be used
(c) A researcher developed a video designed to enhance creative
writing. Fifty high school students were asked to participate in
the study. Twenty-five were randomly assigned to group A and the
other twenty-five were assigned to group B. The video was shown to
group A, and group B read...
Does delaying oral practice hinder learning a foreign language?
Researchers randomly assigned 16 beginning students of...
Does delaying oral practice hinder learning a foreign language?
Researchers randomly assigned 16 beginning students of Russian to
begin speaking practice immediately and another 16 to delay
speaking for 4 weeks. At the end of the semester both groups took a
standard test of comprehension of spoken Russian. Suppose that in
the population of all beginning students, the test scores for early
speaking vary according to the N(34, 8) distribution and
scores for delayed speaking have the N(29, 6)
distribution....
Only need answer for (c) and (f)
You can find scores of a test: {
56,67,67,70,73,73,75,76,77,79,80,81,83,83,85,87,88,89,92,93...
Only need answer for (c) and (f)
You can find scores of a test: {
56,67,67,70,73,73,75,76,77,79,80,81,83,83,85,87,88,89,92,93 }
(a) Obtain a frequency distribution for the test. (The number of
bins and intervals should be determined according to the rules in
the class slides). (b) Draw a frequency histogram.
(c) Use the frequency distribution to compute the mean
and the median and variance. Are there any outliers in this data
set?
(d) Plot the box plot of data based on the statistics...
Only need answer for (f)
You can find scores of a test:
{ 56,67,67,70,73,73,75,76,77,79,80,81,83,83,85,87,88,89,92,93
}
(a)...
Only need answer for (f)
You can find scores of a test:
{ 56,67,67,70,73,73,75,76,77,79,80,81,83,83,85,87,88,89,92,93
}
(a) Obtain a frequency distribution for the test. (The number of
bins and intervals should be determined according to the rules in
the class slides).
(b) Draw a frequency histogram.
(c) Use the frequency distribution to compute the mean and the
median and variance. Are there any outliers in this data set?
(d) Plot the box plot of data based on the statistics you can...
1) The salaries of human resource managers are a numerical
variable.
True or False
2) Suppose...
1) The salaries of human resource managers are a numerical
variable.
True or False
2) Suppose 300 randomly selected human resource managers were
surveyed and asked to identify in which group their current salary
lies—25,000 to 40,000, 40,001 to 55,000, 55,001 to 70,000, 70,001
to 85,000, or 85,001 or higher. Current salary in this scenario is
which of the following?
a) biased statistic
b) categorical variable
c) numerical variable
d) parameter
3) The sample obtained in this study is the...