Question

Solving a basic hypothesis test for a mean. Given the following information: ?̅ = 112.3, ?=29.8, ?=243, ?=0.05

?0: ? = 115.0 ??: ? ≠ 115.0

Calculate the z test statistic and p-value. Draw the area under the the curve that corresponds to the p-value (Hint: There are many ways you can do this. In word, use “review” and “Start Inking”. You can draw it by hand on paper, take a picture and paste it below). Make a concluson by stating whether we should reject or fail to reject the null hypothesis based on the significance level and make a statement in terms of the alternative hypothesis.

2

Answer #1

Danny was conducting the following hypothesis test where μ =
true mean age (years) of Eminem fans: H0: μ = 12 vs. Ha: μ ≠ 12.
With a p-value = 0.0245, at the 1% level of significance, which is
the correct decision?
Group of answer choices
Insufficient evidence to decide.
Reject the null hypothesis.
Fail to reject the null hypothesis.

Given the following information calculate the z test statistic,
p-value and state whether or not to reject the null hypothesis
based on the significance level.
Hoμ=15,Haμ≠15
x¯=12.1,σ=1.5,n=16,α=0.10
What is z
What is p-value
Reject the null or fail to reject the null?

t-test. Test the following claim about the population mean μ at
the given level of significanceα using the given sample statistics.
Assume that the population follows a normal distribution.
(1) State the null hypothesis, H0, and the alternate hypothesis,
Ha indicating which is the claim. You should also list the level of
significance, α and state the type of hypothesis test that must be
done (i.e. left-tailed, right-tailed, or two-tailed).
(2) Show your calculation of the test statistic.
(3) Depending...

Basic Stat Psychology
It covers z tests and inferential statistics
Conduct a z-test
PLEASE SHOW WORK SO I CAN UNDERSTAND
One-hundred test scores were recently obtained from a local high
school to compare to the national average. The mean verbal SAT
score for this sample was 445. Compare this sample to the
population of SAT verbal test scores (SAT Verbal Test ? = 430 and ?
= 120). Alpha=.05
A. Should a one-tailed or two-tailed test be
used?
B. State...

When we conduct a hypothesis test, there are two ways to make a
mistake. The null hypothesis might be correct, and we end up
rejecting it. This is called a Type I error. On the other hand, the
null hypothesis might be false, and we fail to reject it. This is
called a Type II error. Either type of error can be costly, though
not necessarily equally costly. In the following two scenarios,
think about what is the alternative hypothesis?...

The Basic Steps to Calculating a Hypothesis
Test
You want to start by determining whether you are interested in
working with a mean or a proportion. Then identify each of the
parts listed below.
In order to use the formulas for a hypothesis test we first
need to confirm that the sample size requirements for the central
limit theorem are satisfied. See the notes for more information. If
the sample size is not met acknowledge that you need to proceed...

Hypothesis Test for a Population Mean (σσ is
Unknown)
You wish to test the following claim (HaHa) at a significance level
of α=0.10α=0.10.
Ho:μ=77.2Ho:μ=77.2
Ha:μ≠77.2Ha:μ≠77.2
You believe the population is normally distributed, but you do not
know the standard deviation. You obtain a sample of size n=83n=83
with mean M=78.9M=78.9 and a standard deviation of
SD=13.7SD=13.7.
What is the test statistic for this sample? (Report answer accurate
to three decimal places.)
test statistic =
What is the p-value for this...

1. An unstandardized test of aggression has a mean of 35.19. You
take a sample of 44 video game players and find their scores on
this test have a mean of 39.84 and a standard deviation of 12.42.
Are their aggression scores greater than the standard of 35.19?
a. State the null and alternative hypotheses.
b. Find your critical value(s) with a criterion of .01. Remember
if the appropriate line is not available exactly in the table to
pick the...

The Basic Steps to Calculating a Hypothesis
Test
You want to start by determining whether you are interested in
working with a mean or a proportion. Then identify each of the
parts listed below.
In order to use the formulas for a hypothesis test we first
need to confirm that the sample size requirements for the central
limit theorem are satisfied. See the notes for more information. If
the sample size is not met acknowledge that you need to proceed...

Given the following hypothesis:
H0 : μ = 125
H1 : μ ≠ 125
A random sample of six resulted in the following values 132,
132, 130, 143, 140, and 130.
Using the 0.05 significance level, can we conclude the mean is
different from 125?
(a)
What is the decision rule? (Negative amounts should be
indicated by a minus sign. Round your answers to 3 decimal
places.)
Reject H0 : μ = 125 and...

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