Question

- 1. Scores on a standardized lesson are assumed to follow a
normal distribution, with a mean of 100 and a standard deviation of
32. Five tests are randomly selected. What is the mean test score?
(? ) What is the standard error of the scores? ( ?)
X

XXn

NOTE: The standard error is another name for the standard deviation of , that is, standard error = .

X

- Mean = 100, standard error = 4.53
- Mean = 100, standard error = 14.31
- Mean = 100, standard error = 1.43
- Mean = 100, standard error = 32

- 2. Scores on a standardized test are assumed to follow a normal distribution, with a mean of 100 and a standard deviation of 32. Fifty tests are randomly selected. What is the mean test score? (? ) What is the standard error of the scores? ( ?)

NOTE: The standard error is another name for the standard deviation of , that is, standard error = .

- Mean = 100, standard error = 4.53
- Mean = 100, standard error = 14.31
- Mean = 100, standard error = 1.43
- Mean = 100, standard error = 32

- 3. Scores on a standardized test are assumed to follow a normal distribution, with a mean of 100 and a standard deviation of 32. Five hundred tests are randomly selected. What is the mean test score? (? ) What is the standard error of the scores? ( ?)

NOTE: The standard error is another name for the standard deviation of , that is, standard error = .

- Mean = 100, standard error = 4.53
- Mean = 100, standard error = 14.31
- Mean = 100, standard error = 1.43
- Mean = 100, standard error = 32

- Data are collected in a national survey and weighted to reflect the population of all US adults. Suppose that the mean Quality of Life (QOL) score is 70, with a standard deviation of 10. The range of QOL scores is 0-100, with higher scores indicative of better QOL. What is the probability that the mean QOL score in a random sample of 40 adults is 72 or higher?

- 1.26
- 0.8962
- 0.1038
- -0.8962

- Total serum cholesterol levels for individuals 65 years of age and older are assumed to follow a normal distribution, with a mean of 182 and a standard deviation of 14.7. If a random sample of 20 individuals aged 65 years or older is selected, what is the probability that their mean total serum cholesterol level is between 180 and 185?

- 0.2709
- 0.8186
- 0.5477
- 0.0089

- Total serum cholesterol levels for individuals 65 years of age and older are assumed to follow a normal distribution, with a mean of 170 and a standard deviation of 26.8. If a random sample of 40 individuals aged 65 years or older is selected, what is the probability that their mean total serum cholesterol level is between 180 and 185?

- 0.2709
- 0.8186
- 0.5477
- 0.0091

Answer #1

Scores on the verbal portion of the GRE follow a normal
distribution with a mean of 500 and standard deviation of 115.
Question: The middle 95% of the scores fall between a low score
of and a high score of ______________

Suppose the scores on an IQ test approximately follow a normal
distribution with mean 100 and standard deviation 12. Use the
68-95-99.7 Rule to determine approximately what percentage of the
population will score between 100 and 124.

The distribution of scores on a standardized aptitude test is
approximately normal with a mean of 500 and a standard deviation of
95 What is the minimum score needed to be in the top 20%
on this test? Carry your intermediate computations to at least
four decimal places, and round your answer to the nearest
integer.

S.M.A.R.T. test scores are standardized to produce a normal
distribution with a mean of 230 and a standard deviation of 35.
Find the proportion of the population in each of the following
S.M.A.R.T. categories. (6 points)
Genius: Score of greater than 300.
Superior intelligence: Score between 270 and 290.
Average intelligence: Score between 200 and 260.

Test scores on an exam follow a normal
distribution with mean = 72 and standard deviation =
9. For a randomly selected student, find
a)
P(x ≥ 80), b) P(65 <x<90), what is thed minimum svore to be
among top 12 percent

S.M.A.R.T. test scores are standardized to produce a normal
distribution with a mean of 230 and a standard deviation of 35.
Find the proportion of the population in each of the following
S.M.A.R.T. categories.
1. Genius: Score of greater than 330.
2. Superior Intelligence: Score between 280 and 330.
3. Average intelligence: Score between 201 and 260.
Please show all work in equations.

The scores of fourth grade students on a mathematics achievement
test follow a normal distribution with a mean of 75 and standard
deviation of 4. What is the probability the sample mean score of 64
randomly selected students is between 74 and 76?

IQ scores are standardized to produce a normal distribution with
a mean of µ = 100 and a standard deviation of σ = 15. Find the
proportion of the population in the following IQ category: IQ
greater than 160. The proportion is Group of answer choices .0039
.49997 .008 .00003

If student SAT scores are assumed to have a normal distribution
with mean 1000 and standard deviation 100, what percentage of
students can be expected to have SAT scores between 900 and
1100?
Question 5 options:
99%
95%
No answer is correct.
68%
52%

distribution of scores for a certain standardized test is a
normal distribution with a mean of 4 75 and the standard deviation
of 30
between what two values would you expect to find about 68%
between what two values would you expect to find about
99.7%

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