Question

Is a one sample or two sample z test be used for testing Lumber prices being affected by GDP?

Answer #1

The z test for one or two sample proportions test can be used for testing Lumber prices affected by GDP.

The z statistic for one sample proportion test is

, where is the hypothesis proportion , is the proportion of the sample and is the sample size.

The z statistics for two sample proportions test is

, where and are sample proportions, and are the sample size and , where and are no. of sucesses of sample 1 and sample 2 .

The two-sample t-test is one of the most commonly used
hypothesis tests in Six Sigma work. It is applied to compare
whether the average difference between two groups is really
significant or if it is due instead to random chance. Select an
application of the two-sample t-test and describe how it was
justified to use the t-test for this particular application.
Describe what the P-value of the 2-sample t-test of your example in
part (1) means. Note that you are...

Which testing method—one-sample or two-sample parameter tests—is
the better test to use to formulate an answer to a hypothesis

when use r to compute one population mean z statistic testing,
what is the value used in the parameter sigma.x?
population variance for population 1
population standard deviation for population 1
sample variance for sample 1
sample standard deviation for sample 1

A two-tailed hypothesis test is being used to evaluate a
treatment effect with α = .05. If the sample data produce a z-score
statistic of z = -1.24, then what is the correct decision?
Reject the null hypothesis and conclude that the treatment has
no effect.
Reject the null hypothesis and conclude that the treatment has
an effect.
Fail to reject the null hypothesis and conclude that the
treatment has an effect.
Fail to reject the null hypothesis and conclude...

what is the differnce between a one tail z test and a
two tail z test? When should we use one over the other?

Compute the one sample Z-test for the following problems.
A test is conducted for H0: μ = 40, with σ = 5. A
sample size of 100 is selected X= 42.2
What is the null and alternative hypothesis for a 2-tailed test
of significance?
Compute the SEM for this problem.
Compute the one Sample Z-test for this problem.

This semester we have discussed the following statistical
analyses.
Z-test
One-Sample
t-test
Independent Groups
t-test
Repeated Measures t-test
One-Way ANOVA
Repeated Measures ANOVA
Correlation
Fill in the table with the correct defining term.
? is given
µ is given
Groups Compared
Test Used
No
No
Looks at the same group at 2 different times or across two
different conditions
Yes
Yes
Sample against population
X
X
Examines the degree to which two variables relate to one
another...

The test statistic of z=1.21 is obtained when testing the claim
that p?0.653. a. Identify the hypothesis test as being? two-tailed,
left-tailed, or? right-tailed. b. Find the? P-value. c. Using a
significance level of ?=0.01?, should we reject Upper H 0H0 or
should we fail to reject Upper H 0?

A researcher is testing a hypothesis of a single mean. The
critical z value for = .05 and a one-tailed test is 1.645.
The observed z value from sample data is 1.13. The
decision made by the researcher based on this information is to
______ the null hypothesis.

The test statistic value z = -2.22 of a z test for H 0 : μ = 0
versus H a : μ > 0. What is the P-value?
The test statistic value z = 2.22 of a z test for H 0 : μ = 0
versus H a : μ < 0. What is the P-value?
The test statistic value z = -2.22 of a z test for H 0 : μ = 0
versus H a :...

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