Question

How do you figure out assumptions for a two-tailed z test?

Answer #1

Assumptions for the z-test:

• The samples from each population must be independent of

one another.

• The populations from which the samples are taken must be

normally distributed and the population standard

deviations must be know, or the sample sizes must be large

(i.e. n1≥30 and n2≥30.

We can check the Normality assumptions by Drawing Histogram Or Normal Quantile plot.

If histogram shiws symmetrical shape then data is Normal.

Also if the quantile plot shows the linear line then the normality assumption is satisfied.

4. If you have Two tailed Z test of significance and
you have a Z test score of 2.1, and the critical region for an
alpha level of .05 is 1.96, do you ___
a. fail to reject the Ho
b. reject the Ho
c. determine there is insufficient evidence to support at
decision
d. consult a statistician to make a decision on a type XV error

If one is making a two-tailed test and the value of the z test
statistic is -11.12, a correct conclusion from this is
Group of answer choices:
do not reject HO
a type II error has been made.
reject HO
reject HO at the .05 level but not at the .01 level.

You are performing a two-tailed test with test statistic
z=−2.96z=-2.96, find the p-value to 4 decimal places

Decide whether or not the conditions and assumptions for
inference with the two-proportion z-test are satisfied. Explain
your answer.
A researcher wished to test the claim that the rate of
defectives among the computers of two different manufacturers is
the same. She selected two independent random samples and found
that 1.5% of 400 computers from manufacturer A were defective and
3.5% of 200 computers from manufacturer B were defective.
Please explain what the conditions and assumptions for inference
with the...

A z-test with a z observed of 2.56 (two-tailed) would have a
p-value of ______, which would lead a research to _______ the null
hypothesis if alpha is .05.

a. For the following degrees of freedom, list the critical
values for a one-tailed and two-tailed test at a .01 and .05 level
of significance.
.01 .05
df = (Infinity) ___ ___ (One-tailed test)
df = (Infinity) ___ ___ (Two-tailed test)
b. Refer to Table 8.4 in Chapter 8. How do the critical values
you listed in the previous question compare with those listed for
the z-distribution. Explain.

How
do you figure out cash payments for expenses and payments to
creditors?

How do you figure out the adjustments data T-account if they do
not post an amount in the description of the data?

I am trying to figure out how to find the test statistic using
Excel. I understand the formula- that I need to use parameter 'p'
and 'normal distribution' ….z= sample proportion and minus the
'population portion' then we divide p*q and divide n -sample size.
I understand how to populate the data in the formula. I just can't
figure out how to solve this using Excel. (my only option with my
class) I need step by step directions if possible....

How do I find critical values in excel given alpha with a
two-tailed hypothesis test. I have a t- test statistic/

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 11 minutes ago

asked 21 minutes ago

asked 26 minutes ago

asked 34 minutes ago

asked 43 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago