Question

Taken from the below population, would a score of X= 50 be
considered a central score (near the middle of the distribution) or
an extreme score (far out in the tail of the distribution)?

µ=90 and σ=20

Answer #1

1.) If a z-score is larger than _________ it is considered
extreme.
a. +/- 2
b. +/- 0.05
c. +/- 1.64
d. +/- 1.25
2.) For a population with µ = 200 and σ = 25, the distribution
of sample means (based on samples of size n = 25) will have a mean
of _______ and a standard error of _______.
3.) A normal distribution has μ = 70 and σ = 10.
What is the probability of randomly selecting...

1. What z-score value separates 20% of the distribution in the
tail on the left (i.e., the bottom 20% of the distribution) from
the rest of the distribution?
2. What z-score value separates 40% of the distribution in the
tail on the right (i.e., the top 40% of the distribution) from the
rest of the distribution?
3. IQ scores are standardized to produce a normal
distribution with a mean of µ = 100 and a standard deviation of σ =...

3. A population of scores has µ = 44. In this
population, a score of X = 40 corresponds to z = –0.50.
What is the population standard deviation?
a.
2
b.
4
c.
8
d.
-8
4. Last week Tim got a score of X = 54 on a math exam
with µ = 60 and σ = 8. He also got X =
49 on an English exam with µ = 55 and σ = 3, and
he...

The Central Limit Theorem says that when sample size n is taken
from any population with mean μ and standard deviation σ when n is
large, which of the following statements are true?
The distribution of the sample mean is approximately
Normal.
The standard deviation is equal to that of the population.
The distribution of the population is exactly Normal.
The distribution is biased.

A random sample of size 64 is taken from a population with mean
µ = 17 and standard deviation σ = 16. What are the expected value
and the standard deviation for the sampling distribution of the
sample mean?

A random sample of size 64 is taken from a population with mean
µ = 17 and standard deviation σ = 16. What are the expected value
and the standard deviation for the sampling distribution of the
sample mean?
17 and 2, respectively.
17 and 64, respectively.
17 and 16, respectively.
17 and 1, respectively.

A random sample of size 64 is taken from a population with mean
µ = 17 and standard deviation σ = 16. What are the expected value
and the standard deviation for the sampling distribution of the
sample mean?
17 and 2, respectively.
17 and 64, respectively.
17 and 16, respectively.
17 and 1, respectively.

Given the sample results taken from a normal population
distribution: mean = 4.65, σ = 0.32, and n = 19.
For a 90% confidence interval, find the margin-of-error for the
population mean. (use 2 decimal places)

The value of one score in a distribution is changed from X = 20
to X = 30. Which measure(s) of central tendency is (are) certain to
be changed?
Question 34 options:
the mean
the median
the mean and the median
the mode
cannot be determined from information given

1. A sample of 6 voters to be randomly drawn from the U.S
population, when 50% vote Republican. a. The number of Republican
voters in this sample can vary from 0 to 6. Find its probability
distribution. b. Calculate the mean and standard deviation. c. Use
the binomial mean and variance formula to verify your results in b.
d. What is the probability of exactly 2 Republican voters in the
sample? Use the following table to do part a and...

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