Question

Question 3

The text mentions that in order to use the normal distribution for binomial distributions that EITHER n(p) OR n(q) must be > 5.

True

False

Question 4

The reason that both n(p) and n(q) are > 5 is that otherwise the distribution is likely skewed

True

False

Question 5

The reason that the distribution should not be skewed is that the normal distribution assumes that symmetrical distribtuion

True

False

Question 6

Using ONLY the 68, 95, and 99.7 empirical rule, what is the probability that a outcome will be between the mean and one standard deviation above the mean? Give your answer to two decimal places.

Question 7

Using the empirical rule (68,95, 99.7) ONLY what is the probability that an outcome will be below the mean by more than 2 standard deviations? Give you answer in four decimal places

Question 8

Using the
**Exce**l function, what is the probability of an
outcome between -1 and + 1 standard deviations? Input your answer
to four decimal places

Question 9

What is the z-score given a mean of .36, a standard deviation of .048 and a x-value of .32? Give you answer to 4 decimal places

Question 10

Give a z-score of -.8333, what is the probability that an outcome will be greater than that? Give your probability to four decimal places

Answer #1

question3) False.

The rule of thumb is that both n(p) and n(q) should be more than or equal to 5. it is not eithor or condition.

question 4) true.

for unskewd distribution both n(p) and n(q) should be more than 5 or else it will be skewd.

question 5) true

The normal distribution assume the symetrical distribution. it is like a mirror image, which have .5 area in the right and .5 area in the left.

question6 ) the probability will be 0.68

In the empirical rule, an outcome will be between the mean and one standard deviation above the mean gives a probaility of 0.6827.

quetion 7) the probability will be 0.9545

In the empirical rule, an outcome will be between the mean and two standard deviation above the mean gives a probaility of 0.9545

Question 1
A binomial
distribution reflects two possible outcomes, which can be denoted
as "success and failure"
True
False
1 points
Question 2
As a binomial
distribution is discrete, we can not ever use the normal
distribution?
True
False
1 points
Question 3
The text mentions that
in order to use the normal distribution for binomial distributions
that EITHER n(p) OR n(q) must be > 5.
True
False
1 points
Question 4
The reason that both
n(p) and n(q) are...

1.
Assume that a procedure yields a binomial distribution with
n=788 trials and the probability of success for one trial is p=0.67
.
Find the mean for this binomial distribution.
(Round answer to one decimal place.)
μ=
Find the standard deviation for this distribution.
(Round answer to two decimal places.)
σ=
Use the range rule of thumb to find the minimum usual value μ-2σ
and the maximum usual value μ+2σ.
Enter answer as an interval using square-brackets round to 4...

Q1-. A normal distribution has a mean of 15 and a standard
deviation of 2. Find the value that corresponds to the 75th
percentile. Round your answer to two decimal places.
Q2-.Tyrell's SAT math score was in the 64th percentile. If all
SAT math scores are normally distributed with a mean of 500 and a
standard deviation of 100, what is Tyrell's math score? Round your
answer to the nearest whole number.
Q3-.Find the z-score that cuts off an area...

a. If X is a normal random variable with mean 10, and if the
probability that X is less than 11.54 is .72 then what is the
standard deviation of X?
1.75
3.50
4.20
12.25
b. If the standard deviation of a population is 36 and we take a
sample of size 9, then the standard error (the standard deviation
of the sample mean) is
12.00
3.00
108.00
4.00
c. According to the empirical rule, in a normal distribution
about...

A random sample of size n = 40 is selected from a binomial
distribution with population proportion p = 0.25. (a) What will be
the approximate shape of the sampling distribution of p̂?
approximately normal skewed symmetric Correct: Your answer is
correct. (b) What will be the mean and standard deviation (or
standard error) of the sampling distribution of p̂? (Round your
answers to four decimal places.) mean 0.25 Correct: Your answer is
correct. standard deviation 0.0685 Correct: Your answer...

Q1-. A normal distribution has a mean of 15 and a standard
deviation of 2. Find the value that corresponds to the 75th
percentile. Round your answer to two decimal places.
Q2-.Tyrell's SAT math score was in the 64th percentile. If all
SAT math scores are normally distributed with a mean of 500 and a
standard deviation of 100, what is Tyrell's math score? Round your
answer to the nearest whole number.
Q3-.Find the z-score that cuts off an area...

0. Consider a distribution of raw scores in which the
distribution is normal. Consider that each and every score is
converted into a standard score (a z score), such that the
resulting distribution is a normal distribution of standard scores
(a standard normal distribution, also known as the SND). The
standard normal distribution has all the following characteristics,
except
a. The distribution is bell-shaped.
b. The distribution is symmetrical.
c. The mean, median, and mode of the distribution are equal...

Consider the approximately normal population of heights of male
college students with mean μ = 69 inches and standard deviation of
σ = 3.6 inches. A random sample of 10 heights is obtained.
(a) Describe the distribution of x, height of male college
students. skewed right approximately normal skewed left
chi-square
(b) Find the proportion of male college students whose height is
greater than 71 inches. (Give your answer correct to four decimal
places.)
(c) Describe the distribution of x,...

1.) Unlike normal distributions, the standard normal
distribution is purely theoretical.
Select one:
True
False
2.) Patricia's vet told her that the z-score for her dog's
weight range is 1.75 for huskies. Which of the following is the
best interpretation of this standardized score? The weight of
huskies (measured in pounds) is approximately normally distributed
with a mean of 45 lbs and a standard deviation of 3 lbs.
Select one:
a. Patricia's dog's weight is 1.75 times above the average...

QUESTION 1:
We want to estimate the mean change in score µ in the
population of all high school seniors. An SRS of 430 high school
seniors gained an average of x¯¯¯x¯ = 22 points in their
second attempt at the SAT Mathematics exam. Assume that the change
in score has a Normal distribution with standard deviation
48.114.
Find σx¯¯¯σx¯, the standard deviation of the mean change
x¯¯¯x¯. (±±0.001).
Using the 68-95-99.7 Rule (Empirical Rule), give a 99.7%
confidence interval for μμ...

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