Question

solve the following and mark the correct statement.

i)

In which case could the sampling distribution of sample means
be expected to be normally distributed?

A) The parent population is skewed, the sample size is
20.

B) The parent population is jumbled, the sample size is
20

C) The parent population is jumbled, the sample size is
50.

D) The parent population is uniform, the sample size is
20.

ii)

Recent English test scores were approximately normally
distributed with a mean of 60 and a standard deviation of 9. A
random sample of 144 scores was taken. Using a TI‐84, what is the
probability the sample mean is between 58.5 and 61.5?

A) Normalcdf(58.5, 61.5, 60, 0.75)

B) Normalcdf(58.5, 61.5, 60, 9)

C) Normalcdf(58.5, 61.5, 144, 0.75)

D) Normalcdf(58.5, 61.5, 144, 9)

iii)

A sample of 625 vehicles in Qatar was taken. The mean age was
3.5 years with a standard deviation of 0.5 years. What is the point
estimate for the population mean?

A) 0.02

B) 0.5

C) 3.5

D) 625

iv)

Which is an example of cluster sampling?

A) 1% of the population of each school in Qatar is
sampled.

B) A random sample of schools in Qatar is selected, then 5% of
each school

population is sampled.

C) A student in a school is randomly selected, then every
fifth student is selected.

D) The names of all students in a school are placed in a bin,
then 50 are randomly

selected.

v)

Which is an example of biased sampling?

A) The dean decides to start with the second student on the
enrolment, and then picks every fifth student.

B) The dean places the name of each faculty in a bag, then
randomly selects three.

C) The dean uses a random number generator to select 5% of the
student

population.

D) The dean uses a random number generator to select one
student from the

enrolment, and starting from there selects every fourth
student.

vi)

Yousif plans to take a sample of 5 students from his
statistics class of 20. How many different samples are
possible?

A) 5

B) 20

C) 15 504

D) 1 860 480

Answer #1

Which of the following statements is not true for sampling
distributions?
a. A sampling distribution is necessary for making confidence
statements about an unknown population parameter.
b. A sampling distribution depends on the nature of the
population being sampled.
c. When sampling at random from a normal population, the
sampling distribution for the sample average is a normal
distribution.
d. None of the above.
AND
TRUE or FALSE
Assume a random sample of size n is from a normal population....

Match the following descriptions with the correct sampling
technique.
- A sample in which every group of n items is equally
likely.
A sample in which the population is divided into groups, and
then a random sample is taken from each.
- A sample in which every member has an equally likely chance of
selection.
- A sample where a few groups are randomly selected, and then
each member of those groups are measured.
- A sample where the first...

Question 2: Which of the following statements about the
sampling distribution of means is not true?
A. A sample distribution's mean will always equal the parent
population distribution's mean
B. The sampling distribution of means approximates the normal
curve.
C. The mean of a sampling distribution of means is equal to the
population mean.
D. The standard deviation of a sampling distribution of means is
smaller than the standard deviation of the population.

a Since the sampling distribution is approximately normal, use
the NORM.DIST function to determine the probability that a randomly
selected sample of size n = 60 will have a sample proportion of
females less than .2, i.e., 20%.
b. Suppose the company claims that they randomly selected from
this population and the random sample contains 8 females out of 60.
Draw a data distribution.
c. considering the last part, do you believe that the company
truly randomly sampled from the...

Select the correct definition of a sampling distribution of a
sample proportion.
a. a probability distribution of the count of a certain
characteristic of interest for all possible random samples of size
?ntaken from a population
b. a probability distribution of the sample proportions of a
certain characteristic of interest for all possible random samples
of size ?n taken from the population
c. a probability distribution of a population proportion of a
certain characteristic of interest for all possible random...

Which of the following is NOT true regarding the sampling
distribution of the mean (Sample mean X-bar) for a large sample
size (sample size is greater than 36)? A. It has the same mean as
the population. B. It has a smaller standard deviation than the
population standard deviation. C. Approximately it follows a normal
distribution. D. It has the same distribution as the
population.

QUESTION 22
Which one of the following is a correct statement about the
probability distribution of a t random variable?
a.
The mean is zero but the standard deviation is greater than
1.
b.
The mean and standard deviation can be any number.
c.
The mean is zero but the standard deviation is less than 1.
d.
The mean is zero and the standard deviation is 1.
QUESTION 23
A professor finds that for 16 randomly selected students the
time...

Identify the sampling strategy used in each scenario. Select
from simple random, systematic, stratified, cluster, convenience,
or state that this is not a random sampling strategy.
a. Names are written on ping-pong balls, then the balls are
mixed and drawn at random.
b. The population of those on campus are divided into students,
faculty, and staff. A proportional number are then randomly
selected using simple random sampling from each of the three
groups.
c. Individuals are lined up and every...

Which of the following is true regarding the sampling
distribution of the mean for a large sample size?
Select one:
a. It has the same shape, mean, and standard deviation as the
population.
b. It has the same shape and mean as the population, but has a
smaller standard deviation.
c. It has a normal distribution with the same mean as the
population but with a smaller standard deviation.
d. It has a normal distribution with the same mean and...

Quota sampling:
Select one:
a. involves taking a stratified sample in which the number of
sampling units drawn from each stratum is in proportion to the
relative population size of that stratum
b. ensures that certain characteristics of a population sample
will be represented to the exact extent that the researcher
desires.
c. obtains units or people who are most conveniently
available.
d. selects an initial starting point by a random process, and
then selects every nth number on the...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 3 minutes ago

asked 21 minutes ago

asked 32 minutes ago

asked 33 minutes ago

asked 50 minutes ago

asked 51 minutes ago

asked 55 minutes ago

asked 57 minutes ago

asked 57 minutes ago

asked 57 minutes ago

asked 59 minutes ago