Question
In: Statistics and Probability
1.) What is we draw a sample of 225 people from a population with the mean...
1.) What is we draw a sample of 225 people from a population with the mean age of 40 and the standard deviation of 24:
1.) What is the probability of getting a sample mean of 38.2 or lower ?
2.) What is the probability of getting a sample mean of 44.5 or higher ?
3.) What is the probability of getting a sample mean between 38.2 and 44.5 ?
Solutions
orchestra answered 2 years agoRelated Solutions
A random sample of size n = 225 is taken from a population with a population...
A random sample of size n = 225 is taken from a
population with a population proportion P = 0.55.
[You may find it useful to reference the z
table.]
a. Calculate the expected value and the
standard error for the sampling distribution of the sample
proportion. (Round "expected value" to 2 decimal places and
"standard error" to 4 decimal places.)
b. What is the probability that the sample
proportion is between 0.50 and 0.60? (Round “z”
value to 2...
In a study we expect that the sample mean will vary from the population mean ....
In a study we expect that the sample mean will vary from the
population mean . This can either occur because ??of 1) sampling
variation or because 2) the population mean was different than
previously expected. How can we decide between these two
options?
What does it mean to say that we are going to use a sample to draw...
What does it mean to say that we are going to use a sample to
draw an inference about a population? Why is a random sample so
important for this process? If we wanted a random sample of
students in the cafeteria, why couldn’t we just choose the students
who order Diet Pepsi with their lunch? Comment on the statement, “A
random sample is like a miniature population, whereas samples that
are not random are likely to be biased.” Why...
We draw a random sample of size 49 from a normal population with variance 2.1. If...
We draw a random sample of size 49 from a normal population with
variance 2.1. If the sample mean is 21.5, what is a 99% confidence
interval for the population mean?
We draw a random sample of size 36 from a population with standard deviation 3.2. If...
We draw a random sample of size 36 from a population with
standard deviation 3.2. If the sample mean is 27, what is a 95%
confidence interval for the population mean?
[26.7550, 28.2450]
[25.9547, 28.0453]
[25.8567, 28.1433]
[26.8401, 27.1599]
We draw a random sample of size 36 from a population with standard deviation 3.2. If...
We draw a random sample of size 36 from a population with
standard deviation 3.2. If the sample mean is 27, what is a 95%
confidence interval for the population mean?
Many statistical procedures require that we draw a sample from a population whose distribution is approximately...
Many statistical procedures require that we draw a sample from a
population whose distribution is approximately normal. Often we
don’t know whether the population is approximately normal when we
draw the sample. So the only way we assess whether the population
is approximately normal is to examine its sample. Assessing
normality is more important for small samples. Below, you’ll see
some small samples and you’ll be asked to assess whether the
populations they are drawn from can be treated as...
4 We draw a random sample of size 40 from a population with standard deviation 2.5....
4
We draw a random sample of size 40 from a population with standard
deviation 2.5.
Show work in excel with formulas
a
If the
sample mean is 27, what is a 95% confidence interval for the
population mean?
b
If the
sample mean is 27, what is a 99% confidence interval for the
population mean?
c
If the
sample mean is 27, what is a 90% confidence interval for the
population mean?
d
If the
sample mean is 27...
From a random sample from normal population, we observed sample mean=84.5 and sample standard deviation=11.2, n...
From a random sample from normal population, we observed sample
mean=84.5 and sample standard deviation=11.2, n = 16, H0: μ = 80,
Ha: μ < 80. State your conclusion about H0 at
significance level 0.01.
choices:
A. Test statistic: t = 1.61. P-value = 0.9356. Reject the null
hypothesis. There is sufficient evidence to conclude that the mean
is less than 80. The evidence against the null hypothesis is very
strong.
B. Test statistic: t = 1.61. P-value = 0.0644. Do...
A random sample of 225 items from a population results in 60% possessing a given characteristic....
A random sample of 225 items from a population results in 60%
possessing a given characteristic. Using this information, the
researcher constructs a 99% confidence interval to estimate the
population proportion. The resulting confidence interval is
_______.
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